Product Guides
Quick Guide to Choosing the Right LOCTITE® Product
LOCTITE® offers a variety of adhesives tailored for specific applications. Here's a quick rundown to help you choose:
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Industrial Adhesive Types: Complete Guide
Industrial adhesive types: contact adhesive, epoxy, cyanoacrylate, anaerobic threadlockers, structural acrylic, RTV silicone and MS polymer — selection guide for Australian industry.
Read moreEpoxy Adhesive Guide: Two-Part Selection & Cure Times
Epoxy adhesives and epoxy putty: 2-part mixing, cure times, what epoxy won't stick to, types by application, and product selection for Australian tradespeople and maintenance engineers.
Read moreDouble-Sided Tape Guide: Industrial Bonding Without Screws or Welds
What Double Sided Tape Actually Is — A Technical Definition A double-sided tape is a thin laminate of pressure-sensitive adhesive (PSA) on both faces of a backing material — the carrier — protected during shipping by a release liner. When the liner is peeled and the tape pressed onto a substrate, the PSA flows into the surface's microscopic irregularities under finger pressure ("wet-out") and forms a bond by molecular adhesion. The bond develops to peak strength over a defined period — typically 24 to 72 hours at 20–25 °C — as the adhesive completes its wet-out and chemical interactions with the surface. Three properties define how any double-sided tape behaves in service: Adhesive chemistry — the molecular family of the PSA (acrylic, rubber, silicone, hot-melt). Determines temperature limits, ageing behaviour, chemical resistance, and what surfaces it will bond to. Carrier type — the backing layer the adhesive is coated onto (foam, film, tissue, or no-carrier "transfer" tape). Determines load distribution, conformability, and bond gap-filling capacity. Coat weight and thickness — how much adhesive is applied and how thick the carrier is. Determines initial tack, ultimate strength, and how much surface irregularity the tape can tolerate. Get all three matched to the application and the tape works for years. Get any one wrong — wrong chemistry, wrong carrier, or insufficient coat weight — and the tape fails, often in ways that look like "tape problems" but trace back to specification mistakes. This guide is written for the industrial buyer specifying tape for production, mounting, vibration damping, gasketing, automotive trim, signage, or workshop applications where bond reliability matters. The same principles apply to lighter applications, but consumer-grade tape from supermarkets and discount retailers is engineered to a different price-performance point and shouldn't be specified into industrial work where failure is expensive. Adhesive Chemistry — Acrylic, Rubber, Silicone, and Hot-Melt Four PSA families dominate double-sided tape construction. The chemistry choice has more impact on real-world performance than any other tape property. Acrylic adhesive (the industrial workhorse) Acrylic PSAs are polymer chains based on acrylate ester monomers. Compared to other PSA chemistries: Initial tack: lower — acrylic feels less sticky on first contact than rubber. Counter-intuitively, this is by design. Peak adhesion: higher — once dwell time is complete (24–72 hours), acrylic typically reaches 1.5–3× the peak strength of equivalent rubber tape. Temperature range: wide — most industrial acrylic tapes operate from −40 °C to +120 °C continuous, with short excursions to +150 °C or higher. UV resistance: excellent — acrylic does not yellow, embrittle, or lose strength under prolonged sunlight. Chemical resistance: good — survives most automotive fluids, mild solvents, and weather exposure for years. Service life: 10–20+ years when correctly specified and applied. Acrylic is the dominant chemistry for industrial mounting, signage, automotive exterior trim, architectural cladding, and any application where the bond must last. 3M VHB (Very High Bond) is an acrylic foam tape — VHB's reputation comes specifically from the acrylic chemistry and the foam carrier working together. Rubber adhesive (high tack, lower peak) Natural or synthetic rubber-based PSAs feel sticky immediately. Trade-offs: Initial tack: very high — bonds to most surfaces on contact Peak adhesion: lower than acrylic Temperature range: narrow — typically −20 °C to +70 °C; softens above ~80 °C and goes brittle below ~−20 °C UV resistance: poor — yellows and embrittles within months in direct sunlight Creep under sustained load: significant — rubber adhesives flow over time under continuous stress Service life: 1–3 years in typical use; far less in UV or hot environments Rubber-adhesive tapes are the right choice for short-term applications, indoor non-critical mounting, and packaging — the cheap consumer double-sided tape from supermarket aisles is rubber-based. They work for what they are; specifying rubber tape for outdoor or load-bearing industrial applications is the most common reason "the tape failed" support tickets get raised. Silicone adhesive (specialty, extreme conditions) Silicone PSAs survive 230 °C+ continuous and bond to silicone substrates that defeat every other adhesive type. Used in aerospace, electronic encapsulation, high-temperature gasketing, and silicone-rubber bonding. Higher cost; specify only when conditions justify. For rigid structural bonds at elevated temperatures, high-temperature epoxy adhesive is often the more practical alternative. Hot-melt adhesive (mid-tier compromise) Synthetic block copolymers (typically SIS or SBS) — sit between rubber and acrylic on most properties. Faster initial bond than acrylic, longer service life than rubber. Common in packaging tapes and some industrial applications. Property Acrylic Rubber Silicone Hot-melt Initial tack Lower High Moderate Moderate-high Peak strength Highest Lower Moderate Mid Service temp range −40 to +120 °C −20 to +70 °C −60 to +230 °C −20 to +90 °C UV resistance Excellent Poor Excellent Moderate Service life 10–20+ years 1–3 years 20+ years 3–7 years Cost (relative) Mid-high Low Highest Mid Tape Construction — Carrier Type and Why It Matters The PSA is half the story. The carrier — the substrate the adhesive is coated onto — determines how the tape behaves under load, on irregular surfaces, and through service life. Foam carrier (the VHB family) Acrylic or polyethylene foam, 0.4 to 3 mm thick, with adhesive on both faces. Properties: Conforms to surface irregularities — the foam compresses around bolts, seams, gaps, and rough surfaces, maintaining adhesive contact across the entire bond line. Solid-carrier tapes contact only the high points and fail. Distributes stress — foam acts as a viscoelastic spring, absorbing thermal expansion mismatch and dynamic loads (vibration, wind buffeting, panel flex). Solid-carrier tapes concentrate stress at edges and peel. Gap-filling — bonds substrates that aren't perfectly flat against each other; the foam fills the gap. Bond line thickness — the finished joint is the foam thickness; this matters for fit-up tolerance and visual appearance. 3M VHB and equivalent acrylic foam tapes get their reputation from this combination of acrylic chemistry plus foam carrier. The combination is genuinely different from "thick double-sided tape" — the foam's viscoelastic behaviour redistributes stress in ways no solid-carrier tape can match. Film carrier (high-strength, thin profile) Polyester (PET), polyimide, or polypropylene film, typically 25 to 100 microns thick, with adhesive on both faces. Properties: Thin profile — invisible bond line in many applications High tensile strength — film carries shear loads in plane Low conformability — needs flat smooth surfaces; doesn't fill gaps Used for: nameplate mounting, splicing, high-strength thin bonding Tissue carrier (general purpose, easy to die-cut) Non-woven tissue, sometimes called "cloth" tape carrier. Inexpensive, conforms to mild surface irregularity, easy to tear by hand. Used for general purpose mounting, packaging, and stationery double-sided tape. No carrier (transfer tape / pure adhesive film) Adhesive film with no carrier — the adhesive itself is the structural element. Sandwiched between two release liners during shipping. Properties: Thinnest possible bond line Maximum adhesive-to-substrate contact Used for graphic arts, lamination, transfer of decorative films Bond Strength Specifications — Reading the Numbers Industrial double-sided tape data sheets quote three distinct strength values plus a time component. All four matter. Peel strength Force required to peel the tape away from the substrate at a defined angle (typically 90° or 180°) and rate. Measured in Newtons per centimetre (N/cm) or Pounds per inch (lb/in). Indicates resistance to forces trying to lift the tape edge — wind, panel flex, thermal expansion mismatch. Typical values: General-purpose tissue tape ~10–15 N/cm. Acrylic foam (VHB-grade) on metal: 30–100+ N/cm. Shear strength Force per unit area required to slide the tape parallel to the bond line. Measured in kilopascals (kPa) or pounds per square inch (psi). Indicates resistance to sliding loads — gravity on a wall-mounted item, parts trying to slip across each other. Typical values: Rubber tape ~50–150 kPa. Acrylic foam ~300–700 kPa. Tensile (pull) strength Force per unit area required to pull the tape apart perpendicular to the bond line. Measured in kPa or psi. Indicates resistance to direct lift-off forces. Dwell time (the often-missed specification) Time required for the adhesive to develop full bond strength. Acrylic adhesives reach approximately: 50% strength immediately on application 75% strength at 1 hour 90% strength at 24 hours 100% strength at 72 hours If the application is loaded immediately (lifting and walking away) the bond is operating at 50% rated strength. Most "the tape failed" complaints trace back to load applied before dwell time complete — not a tape defect. The most common application mistake: Apply tape, mount the part, expect full strength immediately. The tape is at 50% strength. Plan dwell time into the schedule — apply, fixture lightly, wait 24+ hours before subjecting to design loads. Critical mounting? 72 hours minimum dwell. Outdoor temperature below 15 °C? Dwell time approximately doubles. Surface Energy and Why Plastic Doesn't Stick "Double-sided tape doesn't work on plastic" is one of the most common complaints in adhesive-application support — and it's almost true. The reason is surface energy, measured in dynes per centimetre (dyne/cm). Surface energy is a measure of how readily a liquid (and PSAs behave as very-slow-flowing liquids during bonding) wets out across a surface. High surface energy = liquid spreads and contacts the surface intimately. Low surface energy = liquid beads up and contacts the surface only at points. The bond line area determines the bond strength; if the adhesive can't wet out, the bond is weak even if the chemistry is right. Substrate Surface energy (dyne/cm) Bonding behaviour Stainless steel ~700–1,100 Bonds excellently Aluminium ~840 Bonds excellently Glass ~250–500 Bonds excellently Polycarbonate ~46 Bonds well (HSE plastic) ABS ~42 Bonds well PVC ~39 Bonds adequately LSE threshold ≈ 36 dyne/cm — Below this line, standard tapes struggle Polystyrene ~33 Difficult; needs LSE-rated tape or primer Polyethylene (HDPE, LDPE) ~31 Difficult; needs LSE-rated tape or primer Polypropylene (PP) ~29 Very difficult; needs LSE-rated tape or primer PTFE (Teflon) ~18 Effectively cannot be bonded with PSA tapes Silicone-additive paint (modern self-cleaning) ~22–25 Defeats most adhesives including standard VHB The 36 dyne/cm threshold separates surfaces where standard acrylic tape works (above) from surfaces that need either an LSE-rated tape or a primer (below). 3M's VHB Tape LSE Series is engineered specifically for polypropylene, polyethylene, TPO, and TPE bonding without primer — the LSE chemistry has different acrylate monomers selected to wet out on low surface energy substrates. The silicone-paint problem Modern architectural and automotive paints often have silicone added to the formulation as a "self-cleaning" or hydrophobic property. The silicone migrates to the surface during curing and reduces the effective surface energy to ~22–25 dyne/cm — below even the LSE threshold. The painted surface looks normal to the eye but defeats every standard double-sided tape including VHB. Fitters complain "the wall is fine, the tape's faulty" — neither is faulty. The paint chemistry has changed. Diagnosis: water bead test. Drop water on the surface. If beads up tightly (high contact angle), surface energy is low. If spreads to a thin film, surface energy is high. Silicone-additive paints bead water dramatically — the tell-tale sign. Remedy: solvent prep with isopropyl alcohol (IPA) and abrasion of the surface with fine grit before application. Sometimes still won't work; in that case, mechanical fastening or a different adhesive system (epoxy, methacrylate) is required. Surface Preparation for Maximum Adhesion The single most influential factor in real-world tape performance — more than chemistry, more than carrier, more than brand — is surface preparation. The practical procedure for industrial tape applications: Clean off contamination. Wipe the substrate with isopropyl alcohol (IPA) on a lint-free cloth. Do not use water-based cleaners (residue), do not use mineral spirits (oily residue), do not use methylated spirits (water content). 70%+ IPA from a clean bottle, fresh cloth surface for each wipe. Allow to dry completely. 1–2 minutes evaporation. Don't rush. Abrade if surface energy is borderline. Fine-grit (P400+) abrasive on plastic, painted, or powder-coated surfaces — break the topmost surface layer to expose a higher-energy fresh substrate beneath. Wipe IPA again after abrading. Verify temperature and humidity. Substrate temperature 15–35 °C ideal. Below 10 °C, acrylic adhesives don't tack properly. Below 5 °C, don't bond — wait for warmer conditions or specify low-temperature-rated tape. Humidity above 80% RH delays drying and can leave moisture on the surface. Apply with firm pressure. Press the tape with a roller (not just a finger swipe) — manufacturer's spec is typically 100 kPa pressure for 5+ seconds. The firm pressure is what drives the adhesive into the surface microstructure. Insufficient pressure = insufficient wet-out = weak bond. Allow dwell time before loading. 24 hours before service load. 72 hours before peak design load. Don't subject the bond to vibration, weight, or cycling during dwell. Field-tested rule of thumb: 80% of "tape failure" cases trace to surface contamination not visible to the eye — fingerprint oils from handling, mould-release agents on fresh plastic, plasticiser bloom on automotive trim, condensation moisture on cool metal. The IPA wipe is non-negotiable. A tape with bad prep will fail; a tape with proper prep usually doesn't. Temperature Performance — Application vs Service Tape data sheets quote two distinct temperature specifications. Mixing them up causes specification mistakes. Application temperature The substrate temperature window during which the tape can be applied successfully. For most acrylic tapes: 15–35 °C ideal, with reduced performance below 15 °C and above 40 °C. Below ~5 °C, acrylic adhesives become too rigid to wet out — the bond doesn't form even though the tape feels stuck. The result: apparent bond initially, fails in service. Service temperature The temperature range the bonded joint can withstand after bond formation. Much wider than application range. Industrial acrylic tape: typically −40 °C to +120 °C continuous, +150 °C short excursions. The practical implication: a tape can be applied at 20 °C and then service at −20 °C indefinitely (cold-storage facility, refrigerated trailer). But a tape must not be applied at −20 °C — wait until the substrate warms or use a hot-air gun to bring local temperature into the application window. When NOT to Use Double-Sided Tape An honest specification guide calls out where tape is the wrong answer. Six situations where mechanical fastening, welding, or a different adhesive class is correct: Safety-critical or structural connections. Crane components, vehicle frames, building structural panels, anything where bond failure causes injury or significant damage. Mechanical fasteners give visual indication of impending failure; tape can fail without warning. Untreated low-surface-energy plastic (PP, PE, PTFE) without LSE-rated tape. Don't fight the chemistry — specify LSE tape or use mechanical fastening. Silicone-additive paint or silicone rubber substrate. Standard PSAs don't bond. Specify silicone-specific PSA, prime the surface, or fasten mechanically. Cold application below 5 °C, or wet/oily/dusty surfaces that can't be cleaned. Acrylic adhesives won't tack at low temperature; bonds won't form on contaminated surfaces. Wait, warm the work, or fasten mechanically. Continuous water immersion or extreme vibration. Above splash-zone, acrylic tape is fine. Below waterline or under engine-mount-grade vibration, specify marine adhesive or elastomer mounts plus mechanical fasteners. Removable AND load-bearing. "Removable" tapes that hold under load don't exist. Pick one. If the joint must come apart later AND must hold weight, use mechanical fastening with a sealing gasket. Selecting Tape — A Decision-Tree Framework Work through the table top to bottom. The combination of answers narrows the specification to a small set of viable tape types. Step Question If yes / high If no / low 1 Either substrate below 36 dyne/cm? (PP, PE, silicone paint, PTFE) LSE-rated tape required Standard tape range OK 2 Service life > 5 years OR outdoor/UV exposure? Acrylic chemistry essential Rubber or hot-melt acceptable 3 Substrate flat and smooth (< 0.1 mm irregularity)? Film/tissue carrier OK Foam carrier (VHB-class) required 4 Service temperature exceeds +80 °C continuous? High-temp acrylic or silicone Standard acrylic range 5 Dynamic load (vibration, panel flex, thermal expansion mismatch)? Foam carrier essential for stress redistribution Solid carrier acceptable 6 Sustained shear load (kPa) per bond area? Specify peel + shear values from data sheet, 3× safety factor General-purpose tape adequate 7 Application temperature on site < 15 °C? Low-temp-rated tape OR warm substrate before application Standard application window End-state: each answer narrows the field. Steps 1–3 normally identify chemistry + carrier. Steps 4–7 narrow to specific grades within the family. Match against the data sheet and confirm 3× safety factor on calculated load. Specifying Double-Sided Tape on a Drawing or BOM For engineering drawings and bills of materials, vague specifications cause procurement substitutions and field failures. Use this format: Minimum specification format: Adhesive chemistry — "Acrylic PSA" / "Rubber PSA" / "Silicone PSA" Carrier type and thickness — "Acrylic foam, 1.1 mm" or "PET film, 50 μm" Width × length — "12 mm × 33 m" or "tape width to suit, 25 m roll" Performance class — "VHB equivalent" / "LSE-rated for polyolefin" / "high-temp +200 °C" Specific grade reference — "3M VHB 4910 or approved equivalent" gives buyer freedom while setting performance floor Application notes (call-outs) — "IPA clean substrate. Apply at 20–30 °C. Roller pressure ≥ 100 kPa for 5 sec. Allow 72 hr dwell before peak load." Example BOM line: "Item 14 — Double-sided foam tape, acrylic adhesive, 1.1 mm thick, 12 mm width, VHB-equivalent, 3M VHB 4910 or approved equivalent. Surface prep per drawing note 6. Min. peel 25 N/cm, min. shear 350 kPa on stainless steel substrate." This level of specification protects both supplier and customer. The supplier can substitute equivalent grades transparently. The customer gets a known performance floor. Failures trace cleanly to deviations from spec — not to ambiguous specifications. Example drawing call-out (note block): "Note 6 — Surface preparation for adhesive bonding: (a) clean both substrates with isopropyl alcohol on lint-free cloth; (b) allow to dry 2 minutes; (c) abrade plastic substrates with P400 abrasive, re-clean with IPA; (d) verify substrate temperature 15–35 °C and humidity below 80% RH; (e) apply tape with 100 kPa roller pressure for 5 seconds minimum; (f) do not subject joint to design load until 24 hr dwell complete (72 hr for critical applications)." Engineering drawings with this level of adhesive specification are the difference between repeatable production and field-failure incidents. The note block above can be standardised across an organisation's drawings as a referenced specification — once written, it gets cited on every drawing involving adhesive bonding. Removing Double-Sided Tape Without Damaging the Substrate The strength of industrial double-sided tape is also its removal challenge. Practical removal techniques: Heat (the standard first step) A hairdryer or heat gun on low setting (60–80 °C surface temperature) softens most acrylic and rubber adhesives. Heat for 30–60 seconds, then peel slowly at a low angle (close to parallel with the surface). Don't pull at right angles — that's how paint, vinyl, or substrate gets torn off. 3M Adhesive Remover (or equivalent citrus-based solvent) D-limonene-based citrus solvents soften acrylic adhesive residue. Apply, wait 5 minutes, wipe with a clean cloth. Multiple applications often needed for stubborn residue. Plastic scraper (never metal) For residue, a plastic spatula or razor-edged plastic scraper removes adhesive without scratching paint or substrate. Metal blades scratch — even at shallow angle. Isopropyl alcohol final wipe After heat and scraper removal, IPA wipe leaves a clean substrate ready for re-bonding if required. Reading a Tape Data Sheet Manufacturer data sheets contain the information needed to select tape correctly. The minimum specifications to look for: Adhesive type — acrylic / rubber / silicone / hot-melt Carrier type — foam / film / tissue / no carrier Total tape thickness — in mm or mils Carrier material and density — for foam tapes; affects load distribution Peel strength on stainless steel substrate — usually the reference test Shear strength on stainless steel Application temperature range — narrower than service Service temperature range — continuous and short-term Dwell time to peak strength — usually 24–72 hours UV resistance rating — relevant for outdoor Solvent resistance — list of compatible chemicals Shelf life — typically 12–24 months from manufacture, in cool storage If a data sheet is missing peel and shear values, the tape is likely consumer-grade and the manufacturer hasn't tested to industrial spec. For any industrial specification, insist on full data sheet — "supplier won't supply data sheet" is a red flag for the application. AU Brand Landscape — the Honest Tier Map The AU double-sided tape market spans four broad tiers. The right tier depends on the application — the goal is matching, not always specifying premium. Tier Brands Where stocked Best for Premium engineered (VHB / acrylic foam) 3M VHB, Tesa ACX series Specialist adhesive distributors; some industrial suppliers Long-life structural mounting, automotive, signage, architectural Industrial / trade GSA, Norton Bear, Gorilla, Loctite Industrial suppliers (including AIMS), trade outlets Workshop mounting, automotive trim, indoor industrial use Mid-range / DIY House brands, Tesa standard, Scotch Bunnings, Officeworks, hardware stores Light-duty mounting, household, occasional use Consumer / supermarket Generic imports, supermarket house brands Kmart, Coles, Woolworths Domestic / temporary / fashion / craft For domestic or short-term applications — wall posters, kids' room decor, occasional household projects — supermarket-tier consumer tape works fine for what it is. Don't pay industrial prices for applications that don't need industrial performance. Conversely, don't specify supermarket consumer tape into industrial production work — the failure mode is sudden and the cost of failure exceeds the price difference by orders of magnitude. 3M VHB — the buyer reference standard 3M's VHB (Very High Bond) acrylic foam tape is the buyer reference for premium industrial tape. The product family includes general-purpose (VHB 4910, 5952), low-surface-energy (VHB LSE-110WF, LSE-160WF), and specialty (high-temperature, conformable, extreme outdoor) variants. VHB's reputation is earned — the acrylic chemistry plus foam carrier combination genuinely outperforms equivalent-priced alternatives in most applications. Tesa German engineered tape — Tesa ACX acrylic foam is a direct VHB equivalent with comparable performance. Common in European OEM specifications and where buyers need a non-3M alternative for supply chain reasons. GSA, Norton Bear, Gorilla, Loctite Industrial / trade tier. Suit workshop and trade applications where premium engineered foam isn't necessary. GSA and Norton Bear are stocked at AIMS Industrial; Gorilla and Loctite are widely available across industrial suppliers and hardware retailers. AIMS Industrial Tape Range AIMS stocks double-sided tape and the broader industrial tape range across multiple brands and applications. The full range is at Tapes & Accessories collection and the wider Adhesives, Sealants and Tapes collection. Specific tape products commonly stocked include GSA Double Sided Tape (multiple sizes), Norton Bear heavy-duty double-sided tape, GSA general industrial tape range (duct, foil, silicone wrap, packaging, electrical, thread), and the broader adhesive and sealant range from Loctite, Devcon, Epirez, CRC, and OSI. For specification advice, sourcing a specific tape grade not in stock, or matching an OE-specified tape to an available equivalent, contact the AIMS technical team via contact the AIMS team. Double-sided tape is a pressure-sensitive adhesive (PSA) format — one of several bonding methods available for Australian industry. Where tape is not suited to the application — due to load, temperature, or substrate — the right industrial adhesive type may be cyanoacrylate, epoxy, structural acrylic, or anaerobic depending on the joint. For a complete comparison, see the Industrial Adhesive Types Guide. Frequently Asked Questions Why doesn't double-sided tape stick to plastic? Most plastics — particularly polyethylene, polypropylene, and TPE — have low surface energy (29–31 dyne/cm), below the 36 dyne/cm threshold standard double-sided tapes need to wet out and bond. The adhesive doesn't actually contact the surface intimately at molecular scale, so the bond is weak even if the tape feels stuck. The fix: use a low-surface-energy (LSE) tape rated specifically for polypropylene/polyethylene (3M VHB Tape LSE Series), or apply a primer (3M Tape Primer 94) to the plastic before applying standard tape. Higher-energy plastics (ABS, polycarbonate, PVC) bond well with standard tape after IPA cleaning. How long should I leave double-sided tape before loading it? Acrylic adhesive reaches approximately 50% of peak bond strength immediately, 75% at 1 hour, 90% at 24 hours, and 100% at 72 hours under typical conditions (20 °C, 50% RH). Don't apply load (weight, vibration, peel forces) until at least 24 hours — preferably 72 hours for critical applications. If applying below 15 °C, dwell time approximately doubles. This dwell-time misconception is the most common cause of "the tape failed" complaints — the tape didn't fail, the bond was loaded before reaching service strength. What is VHB tape and why is it different? VHB stands for Very High Bond — it's 3M's family of acrylic foam tapes combining acrylic adhesive chemistry with a foam carrier. The combination gives three properties no solid-carrier tape matches: the foam conforms to surface irregularities maintaining adhesive contact across the full bond line, the foam absorbs and redistributes stress from thermal expansion and vibration, and the acrylic chemistry develops high peak strength and survives 10–20+ years. VHB-grade tapes are used for structural mounting in automotive, architectural cladding, signage, and applications where a bonded joint must outlast the components. The reputation is earned — VHB genuinely outperforms generic "thick double-sided tape" by significant margins. What's the difference between acrylic and rubber double-sided tape? Acrylic adhesive develops slower (50% strength immediate, 100% at 72 hours) but reaches higher peak adhesion, survives wider temperature ranges (−40 to +120 °C continuous), resists UV without yellowing, and lasts 10–20+ years in service. Rubber adhesive tacks higher on first contact but reaches lower peak strength, narrows to −20 to +70 °C service, yellows and embrittles in UV within months, and lasts 1–3 years. Use acrylic for industrial mounting, outdoor, automotive, and long-life applications. Use rubber for short-term, indoor, light-duty, and budget applications. Most consumer supermarket tape is rubber-based — fine for what it is, wrong for industrial work. How do I prepare a surface for maximum tape adhesion? Six-step procedure: (1) wipe with isopropyl alcohol on a lint-free cloth; (2) let dry 1–2 minutes; (3) abrade lightly with P400+ grit if surface is plastic, painted, or powder-coated; (4) wipe IPA again after abrading; (5) confirm temperature 15–35 °C and humidity below 80%; (6) apply with firm roller pressure (100 kPa+) for 5+ seconds. Allow 24+ hours dwell before loading. Around 80% of "tape failure" cases trace to surface contamination not visible to the eye — fingerprint oils, mould release on fresh plastic, condensation on cool metal — so the IPA wipe is non-negotiable. Does double-sided tape work outdoors? Quality acrylic-foam tape (3M VHB, Tesa ACX, equivalent) survives outdoor service for 10–20+ years on UV exposure, rain, and temperature cycling. Rubber adhesive tapes do not — they yellow and embrittle within months. For outdoor applications, specify acrylic chemistry, foam carrier (for thermal expansion accommodation), and verify the tape's data sheet lists outdoor service rating and UV resistance. Cheap supermarket double-sided tape used outdoors will fail within one summer. What is the strongest double-sided tape? By peak bond strength on stainless steel: high-grade 3M VHB and Tesa ACX acrylic foam tapes lead, with shear strength values of 700+ kPa and peel values of 100+ N/cm. Within the VHB range, specific grades are stronger than others — VHB 4926, 4936, and similar heavy-grade variants reach the peak figures. For low-surface-energy substrates (polypropylene, polyethylene), the VHB LSE Series (LSE-110WF, LSE-160WF) is purpose-built for those plastics and outperforms standard VHB on those surfaces by significant margins. Generic "extra strong double-sided tape" from non-specialist suppliers rarely matches engineered foam tape on actual measured strength. Can double-sided tape be removed without damage? Usually yes, with the right technique. Heat the bond line with a hairdryer or heat gun (low setting, 60–80 °C surface temperature) for 30–60 seconds — this softens acrylic and rubber adhesives. Peel slowly at a low angle close to parallel with the surface — don't pull at right angles or the substrate (paint, vinyl, plaster) tears. For residue, citrus-based solvent (3M Adhesive Remover or D-limonene equivalent) softens it for wiping away. Use plastic scrapers, never metal — even careful metal blades scratch paint. Final IPA wipe leaves a clean substrate. Long-cured industrial tape (VHB at 5+ years on metal) sometimes can't be removed without damaging the substrate; that's a feature, not a bug. What is surface energy and why does it matter for tape? Surface energy is a measurable property (units: dyne/cm) that determines how readily an adhesive wets out and contacts a surface at molecular scale. High surface energy (steel ~700+ dyne/cm, glass ~250+) means adhesives spread across the surface fully and form strong bonds. Low surface energy (polypropylene ~29, polyethylene ~31, PTFE ~18) means the adhesive contacts only at points and forms weak bonds — even though it feels stuck. The 36 dyne/cm threshold separates surfaces where standard tapes work from surfaces that need specialist LSE-rated tape or primer. Modern silicone-additive paints (added for self-cleaning effect) drop effective surface energy to ~22–25 dyne/cm and defeat most standard tapes — diagnose with a water bead test. How do I test if a surface is suitable for tape? Two field tests. Water bead test: drop water on the surface. If beads up tightly with high contact angle, surface energy is low — probably needs LSE tape or primer. If spreads to a thin film, surface energy is high — standard tape will bond. Tape patch test: apply a small piece of the proposed tape, leave for 24 hours, then peel test by hand. If peels cleanly and easily — bond inadequate. If tears the substrate or requires substantial force — bond formed properly. Always test on inconspicuous area before committing to large-area application. Can I apply double-sided tape in cold weather? Acrylic adhesives don't tack properly below ~5 °C — they're too rigid to wet out into the surface, and the bond doesn't form even though the tape feels stuck. Application range for most industrial acrylic tapes is 15–35 °C ideal, with reduced performance below 15 °C. For winter applications, either: warm the substrate locally with a heat gun to bring temperature into the application window, wait for warmer conditions, or specify a low-temperature-rated tape (3M VHB GPH series and similar are rated to lower application temperatures). Note that service temperature is typically much wider than application — a tape applied at 20 °C can serve at −40 °C indefinitely once bonded. What's the difference between VHB and standard double-sided tape? VHB (Very High Bond) refers to acrylic foam tapes — the combination of acrylic adhesive chemistry and a foam carrier. The foam provides three benefits standard solid-carrier tape can't deliver: conformability to surface irregularities (maintains contact across the bond line), stress redistribution (handles thermal expansion mismatch and vibration without peeling), and gap-filling (bonds substrates that aren't perfectly flat). The acrylic chemistry adds long service life, wide temperature range, and UV resistance. The combination genuinely outperforms thick rubber tape or general-purpose acrylic film tape — VHB isn't just "thick double-sided tape," it's a different functional design. Where solid-carrier tapes peel under stress, VHB foam absorbs the stress and the bond holds. Is double-sided tape food safe? Most industrial acrylic tapes are not rated for direct food contact. For food-zone applications, specify a tape with explicit FDA or equivalent food-grade compliance certification — these use food-grade acrylic adhesive formulations and food-contact-rated carriers. 3M's food-zone-rated VHB variants exist; non-food-rated standard VHB and consumer tape can leach plasticisers or adhesive compounds into food and should not be used in direct food contact. For non-direct food applications (food production equipment housings, structural mounting outside the food zone), standard industrial tape is fine. How long does double-sided tape last? Service life varies enormously by chemistry and environment. High-grade acrylic foam (VHB, Tesa ACX) typically lasts 10–20+ years in industrial outdoor service when correctly specified and applied. Industrial acrylic film and tissue tape: 5–10 years indoor, 2–5 years outdoor. Rubber-based tape: 1–3 years general use, 6–12 months outdoor. Hot-melt: 3–7 years. Consumer supermarket tape: 1 year or less in any service. Service life depends on the chemistry, the substrate, the environment (UV, temperature, chemical exposure), and the bond stress. The figures above are typical; specific products may exceed or fall short. Manufacturer data sheets quote tested service life for their products — read the sheet for the specific grade. Where can I buy industrial double-sided tape in Australia? For premium engineered tapes (3M VHB, Tesa ACX), specialist adhesive distributors and some industrial suppliers stock the range. For industrial / trade tape (GSA, Norton Bear, Gorilla, Loctite), industrial suppliers including AIMS Industrial stock the range — see the Tapes & Accessories collection or the broader Adhesives, Sealants and Tapes collection. For mid-range / DIY (Tesa standard, Scotch), hardware retailers including Bunnings stock the range. For consumer / supermarket grade, Kmart, Coles, Woolworths, and similar. Match the tier to the application; specifying premium tape for domestic use is wasteful, specifying consumer tape for industrial use is risky. For technical advice on grade selection or sourcing a specific tape, contact the AIMS technical team. Cross-reference our Loctite Application Guide when picking between 222, 243, 263, 271, 401, 567, 577 or 638. People Also Ask — Double-Sided Tape Q: What is the difference between acrylic and rubber adhesive in double-sided tape? Acrylic adhesive (also called pressure-sensitive acrylic) offers excellent long-term bond stability, UV resistance, and temperature performance — it is the industrial workhorse and is the adhesive used in high-performance foam tapes. Rubber adhesive has a higher initial tack, making it grab strongly on first contact, but it is less resistant to UV, elevated temperatures, and ageing than acrylic. Rubber-based tapes suit short-term or indoor applications where immediate adhesion is the priority; acrylic suits permanent outdoor or high-stress bonds. Q: How long does double-sided tape take to reach full bond strength? Double-sided tape reaches full bond strength over a defined dwell period after application — typically 24 to 72 hours at 20–25 °C as the adhesive completes its wet-out and chemical interaction with the surface. Initial adhesion is immediate on first contact, but the bond continues to develop during this dwell period. Applying load or stress to the joint before the dwell period is complete can reduce the final bond strength. Q: Why does double-sided tape not stick properly to some plastics? Many plastics — including polyethylene (PE), polypropylene (PP), and PTFE — have very low surface energy, meaning that adhesives cannot wet out their surface effectively and form only a weak bond. Surface energy is a measure of how attractive a surface is to adhesives at the molecular level. Bonding to low-energy plastics typically requires surface pre-treatment (flame treatment, plasma treatment, or primer) to raise the surface energy before the tape is applied, or the use of a specialist adhesive formulated for low-energy substrates. Q: What is the difference between peel strength and shear strength in tape specifications? Peel strength measures the force required to peel the tape away from a surface at an angle — typically 90° or 180° — and reflects how well the tape resists being pulled back from its bonded surface. Shear strength measures the force required to slide the tape along the bonded surface in the plane of the joint, and is the relevant figure for applications where the tape holds a component against a surface under the weight of that component. Selecting the right tape requires matching its strength profile to the direction of the applied load. Need pan head screws? Browse the AIMS range at pan head screws.
Read moreLoctite 222: Purple Low-Strength Threadlocker Guide
Purple low-strength threadlocker for fasteners under 6mm. Cure times, breakaway torque, 222 vs 243, Activator 7471 for inactive metals, and the 222MS Mil-Spec variant — explained.
Read moreRTV Silicone Gasket Maker Guide: Application, Cure Time and Selecting the Right Product
Pick up a bottle of RTV silicone gasket maker and the shelf next to it has five more — black, red, grey, blue, copper. Most people grab the one they.
Read moreloctite-401-guide
What Is Loctite 401? Loctite 401 is a general-purpose cyanoacrylate ("super glue") industrial instant adhesive made by Henkel. It bonds metals, plastics, rubber, ceramics, leather, paper and most porous and non-porous materials, and develops handling strength in seconds. It's the most widely-used grade in the Loctite cyanoacrylate range and the default starting point for instant adhesive selection across maintenance, assembly and production work. What is cyanoacrylate? Cyanoacrylate (CA) is the chemistry family behind every "super glue" or "instant adhesive". It cures rapidly by reacting with trace surface moisture rather than air drying or heat curing. Loctite 401 is one cyanoacrylate grade among many — others in the Loctite range are formulated for specific substrates, gap sizes, flexibility, temperature resistance or impact resistance. What is Loctite 401 best for? Close-fitting joints in production assembly, maintenance bonding of small parts, prototyping, and any application where you need a fast, clean, high-strength bond on a small area. It's not the right grade for flexible joints, large gaps, very rough surfaces or high-temperature/high-impact service — Henkel publishes dedicated grades for those cases. Loctite 401 is an industrial instant adhesive used across manufacturing, maintenance, and assembly work to bond metals, plastics, rubber, ceramics, and porous materials — fast. If you’ve ever reached for a bottle of super glue and wondered whether this is the same thing, the short answer is: same chemistry, different product. Here’s everything you need to select, apply, and store it correctly. Quick answer — Loctite 401 essentials What it is: Loctite 401 is an industrial-grade ethyl cyanoacrylate (CA) instant adhesive — same chemistry family as consumer super glue but engineered for industrial substrates and consistency. Cure time: Fixture in 5-20 seconds depending on substrate. Full cure 24 hours. Faster on porous materials (rubber, leather, wood), slower on glass and acidic surfaces. What it bonds: Metals, most plastics, rubber, ceramics, porous materials. Doesn't bond well: PE, PP, PTFE, silicone (use Loctite primer) · oily/wet surfaces · large gaps over 0.1mm. Loctite 401 vs 406: 401 = general purpose, medium viscosity. 406 = specifically for rubber/plastic, low viscosity. 414 = metal-bonding optimised. Loctite 401 is an industrial-grade ethyl cyanoacrylate (CA) instant adhesive made by Henkel as part of the Prism range. It bonds metals, rigid plastics, rubber, ceramics, and porous materials in 3 to 10 seconds, with full cure in 24 hours. Loctite 401 is the general-purpose product in the range — surface-insensitive (it bonds reliably on chromated and acidic metal surfaces where standard super glues fail), medium viscosity, and the most commonly stocked Loctite instant adhesive in Australian workshops. Loctite 401 — Quick Reference Property Value Chemistry Ethyl cyanoacrylate (CA / super glue family) Viscosity 100–120 mPa·s (medium) Fixture time 3–10 seconds (substrate dependent) Full cure 24 hours at 22°C Operating temperature −55°C to +80°C Shear strength on steel ~14 N/mm² Max bond gap <0.1 mm (not a gap filler) Bonds well Metals, rigid plastics, rubber, ceramics, porous materials Does NOT bond PE, PP, PTFE, silicone (use SF 770 primer) Shelf life 12 months unopened, 30 days after opening What Is Loctite 401? Loctite 401 is an ethyl cyanoacrylate (ECA) instant adhesive, part of Henkel’s industrial Prism range. Like all cyanoacrylates, it cures on contact with surface moisture — no mixing, no heat, no UV light required. What sets 401 apart from consumer super glues is its surface-insensitive formulation: it performs reliably on acidic or chemically treated surfaces such as chromated metals and galvanised steel, where standard cyanoacrylates often fail to achieve full strength. The “Prism” designation refers to Henkel’s industrial-grade instant adhesive line, which includes 401, 406, 408, 454, 480, and 495 among others — each optimised for specific substrate and application requirements. Loctite 401 is the general-purpose product in that range. Loctite 401 is not a threadlocker. If you need to secure a bolt or fitting against loosening, see our Loctite Threadlocker Guide for the right product. Threadlockers (Loctite 222, 243, 270, and others) are a completely different product class — anaerobic adhesives that cure in the absence of oxygen, not cyanoacrylates. Loctite 401 Technical Specifications The table below summarises the key performance properties from the Henkel technical data sheet. These values apply at 22°C unless otherwise stated. Property Value Chemistry Ethyl cyanoacrylate (ECA) Appearance Clear, colourless liquid Viscosity (Brookfield) 100–120 mPa·s (medium viscosity) Specific gravity 1.1 at 25°C Fixture time 3–10 seconds (substrate dependent) Full cure 24 hours at 22°C Operating temperature –55°C to +80°C Shear strength — steel ~14 N/mm² Shear strength — aluminium ~12 N/mm² Shear strength — NBR rubber ~9 N/mm² Maximum bond gap <0.1 mm Shelf life (unopened, 2–8°C) 12 months After opening Use within 30 days Available sizes 3 g, 25 ml, 100 ml What Can Loctite 401 Bond? Loctite 401 bonds a wide range of substrates. The table below lists typical fixture times by surface type at 22°C and 50% relative humidity. Fixture time is the point at which the assembly can be handled without disturbing the bond — full strength requires 24 hours. Substrate Typical Fixture Time Notes Steel (degreased) 3–5 seconds Excellent adhesion Aluminium 5–10 seconds Excellent adhesion Galvanised steel 5–10 seconds Surface-insensitive formula performs where standard CA adhesives may not Chromated / zinc-plated metal 5–10 seconds Surface-insensitive advantage Stainless steel 10–30 seconds Passive surface — use activator SF 7457 if speed required ABS plastic 5–15 seconds Good adhesion Acrylic (PMMA) 5–15 seconds Good adhesion; avoid solvent-sensitive grades Polycarbonate 10–20 seconds Adequate; use 406 for better results on large PC surfaces Nylon / PA 10–20 seconds Adequate adhesion NBR (nitrile rubber) 5–10 seconds Good adhesion, ~9 N/mm² EPDM rubber 5–15 seconds Good adhesion; use 406 for best results Natural rubber 5–10 seconds Good adhesion Ceramic 10–20 seconds Good adhesion on clean, dry surfaces Wood / cardboard 5–15 seconds Good; moisture in porous materials aids cure Polyethylene (PE) Poor without primer Use SF 770 primer first Polypropylene (PP) Poor without primer Use SF 770 primer first PTFE (Teflon) Poor without primer Use SF 770 primer first Silicone rubber Very poor Not recommended — use silicone-specific adhesive Gap fill limitation: Loctite 401 is optimised for close-fitting joints with a bond gap under 0.1 mm. Performance drops off significantly as gap increases — it will not bridge or fill visible gaps. For gaps of 0.1–0.5 mm, use Loctite 454 gel. For structural gap filling, use an epoxy. Is Loctite 401 the Same as Super Glue? Same chemistry, different product. Both Loctite 401 and consumer super glues are ethyl cyanoacrylate — the underlying cure mechanism is identical. The differences are in formulation, consistency, and intended use. Property Loctite 401 (Prism) Consumer Super Glue Chemistry Ethyl cyanoacrylate Ethyl or methyl cyanoacrylate Surface sensitivity Surface-insensitive formulation Standard — may fail on acidic/chromated surfaces Viscosity Controlled 100–120 mPa·s Variable, unspecified Shear strength ~14 N/mm² on steel (specified) Not specified Shelf life 12 months (unopened, refrigerated) Typically 12 months, variable Quality consistency Industrial-grade, batch-controlled Variable Intended use Industrial, engineering, assembly Household repairs, hobbyist For one-off household repairs, consumer super glue is fine. For industrial assembly, fixturing, or any application where bond performance needs to be predictable and repeatable, the industrial Prism range is the correct choice. The defined specs matter — 14 N/mm² shear strength means something when you’re designing a joint. An unspecified consumer product does not. Loctite 401 vs 406 vs 480 vs 495 — Which Do You Need? The Prism range can look confusing from the outside. Here is a direct comparison of the four most commonly used industrial instant adhesives: Product Viscosity Best For Key Feature Avoid For 401 Medium (100–120 mPa·s) Metals, rigid plastics, rubber, porous materials — general purpose Surface-insensitive; works on chromated & acidic surfaces PE, PP, PTFE without primer; flexible joints; large gaps 406 Low (50–100 mPa·s) Difficult plastics (ABS, PC, acrylic), elastomers, rubbers Surface-active ingredient for low-energy plastics and elastomers Porous materials (less effective than 401); metals where 401 is adequate 480 Medium (100–500 mPa·s, black) Dynamic assemblies subject to shock, vibration, or impact Rubber-toughened; flexible, impact-resistant bond Where maximum shear strength is needed; visible joints (cures black) 495 Low (80–200 mPa·s) General purpose metals and plastics; similar range to 401 General-purpose CA; good all-rounder Less surface-insensitive than 401 on chromated/acidic surfaces Default choice rule: Start with 401 for metal-to-metal, metal-to-rigid plastic, and most rubber applications. Move to 406 if you’re bonding flexible plastics, soft elastomers, or difficult low-energy substrates. Move to 480 if the assembly experiences dynamic loading. Add SF 770 primer if the substrate is PE, PP, or PTFE regardless of which adhesive you choose. For threadlockers and thread sealants — completely separate products — see our Thread Locking and Sealing Guide. When to Use Primer or Activator With Loctite 401 Most bonding with Loctite 401 requires no additional products. Two situations call for a supplementary product. Loctite SF 770 — Polyolefin Primer Use SF 770 when bonding polyethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE), or thermoplastic rubbers. These are “low-energy” surfaces — cyanoacrylates cannot wet them reliably without surface activation. Apply SF 770 by brush to one bond surface, allow it to dry (30 seconds), then immediately apply Loctite 401 to the primed surface and assemble. Do not apply activator to a primed surface. Activators — SF 7457, SF 7452, SF 7455 Use an activator when: The substrate is a passive metal (stainless steel, anodised aluminium, certain chromates) that cures slowly or inconsistently Your process requires faster than standard fixture time You are bonding in low-humidity conditions where atmospheric moisture is limited Apply activator to one bond surface by brush or spray. Apply Loctite 401 to the opposite surface. Assemble immediately. The activator provides the moisture source needed to initiate polymerisation and accelerates cure from seconds to near-instantaneous. Do not saturate the surface — a thin, even coat is sufficient. Activator vs primer — they are not the same: SF 770 modifies a low-energy surface to accept adhesive. Activators (SF 7457, SF 7452) initiate or speed up cure on surfaces that already accept CA adhesive but cure slowly. Using an activator on PE or PP without primer will not solve the adhesion problem. How to Apply Loctite 401 Follow these steps for a clean, strong bond. Clean both surfaces. Remove oil, grease, dust, and release agents with isopropanol or acetone — or a purpose-formulated industrial degreaser. Dry completely. Surface contamination is the most common cause of bond failure. Check the fit. The joint gap must be less than 0.1 mm. If surfaces are rough or mismatched, address this before bonding. Cyanoacrylate is not a gap filler. Apply adhesive to one surface only. A single thin film is sufficient — typically one drop per 6–10 cm² of bond area. Less is more. Excess adhesive slows cure, reduces strength, and causes bloom. Assemble immediately. Position the parts and apply firm contact pressure for 5–10 seconds. Do not slide parts relative to each other after contact. Allow fixture time before handling. The assembly can be carefully moved after 10–30 seconds. Avoid loading the joint for at least 15 minutes; allow 24 hours before applying full design load. Remove excess adhesive promptly. Uncured adhesive on adjacent surfaces can be wiped with acetone before it cures. Cured adhesive can be removed mechanically or with Loctite SF 7200 debonder. Skin contact: Cyanoacrylate bonds skin immediately. Wear nitrile gloves when working with Loctite 401. If skin bonding occurs, immerse in warm soapy water and peel apart gently — do not pull forcefully. Acetone (nail polish remover) applied after soaking will help separate bonded skin. Common Failures and How to Fix Them White residue (bloom / frosting) around the joint Cause: Excess adhesive vapourises during cure, reacts with atmospheric moisture, and deposits as white polymer residue on nearby surfaces. Fix: Reduce the quantity of adhesive applied. Ensure good ventilation at the bond site. In high-humidity environments, use activator to accelerate cure and minimise vapour off-gassing. Bloom is cosmetic — the bond itself is structurally sound. Brittle bond — joint cracks or fails under vibration or impact Cause: Loctite 401 produces a rigid bond that does not flex. Dynamic loading, vibration, or impact will crack a 401 bond line over time. Fix: Switch to Loctite 480 (rubber-toughened cyanoacrylate) for assemblies subject to dynamic loads. If flexibility is required, consider a polyurethane or MS-polymer adhesive. Poor adhesion or bond failure on plastics Cause: The substrate is a low-energy plastic (PE, PP, PTFE, TPR) that CA adhesives cannot wet reliably. Fix: Apply Loctite SF 770 polyolefin primer before bonding. For challenging plastics that are not polyolefins (e.g. silicone), the adhesive technology needed is different — neither 401 nor 406 will work reliably without an appropriate primer or alternative adhesive system. Very slow cure on metal Cause: Passive metal surfaces (stainless steel, anodised aluminium, certain chromates) lack the surface reactivity and moisture needed to initiate rapid CA cure. Fix: Apply activator SF 7457 or SF 7452 to one bond surface. Assemble immediately after applying Loctite 401 to the opposite surface. Bond weakens or fails after a short period in service Cause: Most commonly, surface contamination prior to bonding — particularly oil or grease residue that was not fully removed. Also possible: excessive bond gap, or the joint is loaded in peel (cyanoacrylates are weak in peel — joint design should favour shear). Fix: Degrease thoroughly before bonding. Redesign the joint to load in shear rather than peel where possible. If peel resistance is critical, use a structural epoxy instead. Removing Loctite 401 — Debonding and Disassembly Cured cyanoacrylate is harder to remove than people expect. There are three reliable approaches depending on the situation. Mechanical removal For metal-to-metal or rigid assemblies, apply heat using a hot air gun. Loctite 401 begins to degrade above 80°C. Once the bond softens, pry apart with a flat tool. The bond area will need cleaning and degreasing before re-bonding. Chemical debonder — Loctite SF 7200 Loctite SF 7200 is a specialist debonder formulated to soften cured cyanoacrylate. Apply to the bond line and allow to soak for 30 minutes to several hours depending on joint size. The adhesive will soften enough to allow disassembly. Not suitable for all plastics — test on an inconspicuous area first. Acetone (nail polish remover) Acetone dissolves uncured and lightly cured cyanoacrylate effectively. For recently bonded joints that have not reached full cure, acetone applied directly to the bond line may allow disassembly. For fully cured bonds, it has limited effect without extended contact. Not suitable for polycarbonate, acrylic, or ABS plastics — acetone will craze or dissolve these surfaces. Skin bonding: If skin contact bonds occur, immerse in warm soapy water and gently peel apart. Do not pull forcefully. Once loosened, acetone (nail polish remover) assists in separating bonded skin. Medical attention is rarely required unless eyes are involved — eye contact requires immediate flushing with water and medical review. Typical Applications in Industrial Settings Loctite 401 appears across a wide range of industries and tasks. The following are common Australian industrial applications. Manufacturing and assembly Fixture bonding in production lines — temporarily or permanently locating small components during assembly before a secondary adhesive, fastener, or weld is applied. Also used for permanent bonding of nameplates, labels, gaskets, and sensor housings. Maintenance and repair Workshop repairs of rubber seals, gaskets, and hose fittings. Bonding cracked plastic housings, guards, and covers. Reattaching rubber bumpers, feet, and anti-vibration mounts on machinery. Automotive and fleet Trim and moulding bonding, rubber seal repair, interior plastic repairs. Note that Loctite 401 is not rated for continuous fuel or oil immersion — for such applications, a fuel-resistant adhesive is required. Electronics and instrumentation Bonding small electronic components, strain relief, sensor mounting. Loctite 401 is electrically non-conductive after cure, making it suitable for low-voltage insulating applications where the adhesive is not exposed to high temperatures. What Loctite 401 is not suited for Structural load-bearing applications (use structural epoxy). Joints subjected to peel loads (CA adhesives are weak in peel — redesign the joint or use epoxy). Surfaces continuously immersed in water or solvents. High-temperature applications above 80°C. Flexible or elastomeric assemblies subject to repeated flexing (use 480 or polyurethane adhesive). For load-bearing or gap-filling bonds where cyanoacrylate is unsuitable, two-part epoxy adhesive is the typical alternative. Loctite 401 Storage and Shelf Life Cyanoacrylate adhesives cure on contact with moisture — including atmospheric moisture. Storage conditions directly affect product life. Condition Guidance Unopened, refrigerated (2–8°C) 12 months shelf life Unopened, room temperature Reduced shelf life — check date regularly Opened — store at Room temperature (NOT refrigerated) After opening — use within 30 days for best performance Cap Reseal tightly after every use Keep away from Direct sunlight, heat sources, humidity Why not refrigerate after opening? When a cold bottle is brought out of the fridge, it warms up and condensation forms inside the container. That moisture initiates polymerisation — effectively curing adhesive inside the bottle. Store opened product at stable room temperature and keep the cap sealed between uses. If the adhesive is stringing, gelling, or producing poor bonds, the product has likely degraded and should be replaced. Attempting to use expired or partially cured product produces unreliable results. Loctite 401 is one of several adhesive types used in Australian industry. Cyanoacrylate instant adhesives are ideal for small, close-fitting joints with fast fixture requirements — but they are not the right choice for every application. For a complete comparison of adhesive types — including contact adhesive, epoxy, anaerobic threadlockers, structural acrylic, and RTV silicone — see the Industrial Adhesive Types Guide. Frequently Asked Questions What is Loctite 401 used for? Loctite 401 is a medium-viscosity instant adhesive (cyanoacrylate) designed for industrial bonding of metals, rigid plastics, rubber, ceramics, and porous materials such as wood and cardboard. It is surface-insensitive, meaning it bonds reliably on acidic or chromated surfaces where standard super glues fail. Typical applications include fixture bonding in manufacturing, rubber gasket assembly, small metal component bonding, and any application requiring a fast, strong bond on close-fitting joints. Is Loctite 401 the same as super glue? Loctite 401 and consumer super glue share the same chemistry — both are ethyl cyanoacrylate (ECA) — but they are not the same product. Loctite 401 is part of the industrial Prism range and is formulated to be surface-insensitive, meaning it performs reliably on difficult surfaces such as chromate-treated metals and acidic substrates where standard super glue often fails. It also has defined viscosity and shear strength specifications, a controlled shelf life, and consistent industrial-grade quality. Consumer super glues are unspecified, variable in performance, and generally unsuitable for industrial or engineering applications. What is the difference between Loctite 401 and 406? Both are industrial instant adhesives, but they are optimised for different applications. Loctite 401 is a general-purpose, surface-insensitive formula that bonds metals, rigid plastics, rubber, and porous materials. Loctite 406 is specifically formulated for difficult-to-bond plastics (including ABS, polycarbonate, and acrylic) and elastomers — it contains a surface-active ingredient that improves adhesion to low-energy surfaces. For most metals and mixed-substrate assemblies, 401 is the better choice. For challenging plastics and rubber applications, 406 is preferred. Does Loctite 401 need to be refrigerated? Unopened bottles of Loctite 401 should be stored refrigerated at 2–8°C to achieve the full 12-month shelf life. However, once opened, do NOT refrigerate the bottle. Returning an opened bottle to the fridge causes condensation inside the container when it warms up, and that moisture will prematurely cure the adhesive. After opening, store at room temperature in a dry location, keep the cap tightly sealed, and use the product within 30 days for best performance. What is the fixture time of Loctite 401? Loctite 401 fixtures (reaches handling strength) in 3 to 10 seconds on most substrates at room temperature, depending on the surface type, humidity level, and bond gap. Steel and aluminium typically fixture at the faster end of this range. Inactive metals such as stainless steel or anodised aluminium may be slower. Full cure to rated strength takes 24 hours at 22°C. If faster cure is needed, use activator LOCTITE SF 7457 or SF 7452 on one bond surface. What temperature can Loctite 401 withstand? Cured Loctite 401 has an operating temperature range of –55°C to +80°C. It maintains bond integrity through both freezing conditions and elevated heat up to 80°C. For applications requiring higher temperature resistance, consider Loctite 4014 (rated to +120°C) or a structural epoxy adhesive. Can Loctite 401 bond rubber? Yes, Loctite 401 bonds most common rubber types including NBR (nitrile), natural rubber, EPDM, and neoprene. On NBR rubber, the shear strength is approximately 9 N/mm². The surface-insensitive formulation helps with the variability in rubber surface chemistry. For difficult elastomers such as silicone, PTFE-based materials, or very low-energy thermoplastic rubbers, Loctite 406 combined with SF 770 primer is the more reliable choice. Where a more flexible or gap-filling bond is required, flexible epoxy adhesive or polyurethane adhesive is more appropriate for rubber substrates. Can Loctite 401 bond polyethylene or polypropylene? Not reliably without surface preparation. Polyethylene (PE) and polypropylene (PP) are low-surface-energy plastics that resist bonding with standard cyanoacrylate adhesives, including Loctite 401. To bond PE or PP, apply Loctite SF 770 polyolefin primer to the surface, allow it to dry, then apply Loctite 401 (or 406) immediately. The primer activates the low-energy surface and enables a strong bond. Without primer, expect poor adhesion and early bond failure. Why is my Loctite 401 turning white (blooming)? White residue or frosting around the bond line — known as bloom — is caused by excess cyanoacrylate vapour curing on contact with ambient moisture. It happens when too much adhesive is applied, when humidity is high, or when ventilation is poor. To prevent bloom: use the minimum effective quantity of adhesive (a thin film is sufficient for close-fitting joints), ensure good ventilation, and if working in humid conditions, use activator SF 7457 to speed up cure and reduce vapour off-gassing. Bloom is cosmetic, not structural — the bond itself is unaffected. What is the maximum gap Loctite 401 can fill? Loctite 401 is optimised for close-fitting joints with bond gaps of less than 0.1 mm. It is not a gap-filling adhesive — performance degrades significantly with increasing gap size, and it will not bridge or fill visible gaps reliably. For loose-fitting joints or irregular surfaces with gaps of 0.1–0.5 mm, use Loctite 454 instant adhesive gel. For larger gaps or structural repairs, use an epoxy adhesive. What is the difference between Loctite 401 and 480? Loctite 401 produces a rigid, high-strength bond optimised for stiff assemblies and close-fitting joints. Loctite 480 is a rubber-toughened, flexible cyanoacrylate that produces a lower-strength but impact- and vibration-resistant bond — it appears black after cure. Use 401 where maximum shear strength is required on stable, non-flexing assemblies. Use 480 where the joint will experience dynamic loads, shock, or vibration, or where some bond flexibility is needed to prevent cracking. How do I speed up Loctite 401 cure time? Apply Loctite activator SF 7457 or SF 7452 to one bond surface before assembling the joint. The activator reacts with the cyanoacrylate on contact and accelerates cure to within seconds. This is particularly useful on passive metals (stainless steel, anodised aluminium) where natural cure can be slow. Do not apply activator to primed surfaces (SF 770). Alternatively, slightly increasing ambient humidity or temperature (within the product's working range) also speeds cure. Buy Loctite 401 from AIMS Industrial AIMS Industrial stocks Loctite 401 Prism Instant Adhesive in 3 g and 25 ml sizes, available online with fast Australia-wide delivery. Shop Loctite 401 Instant Adhesive → For other Loctite products including threadlockers, thread sealants, and retaining compounds, see our full Loctite Threadlocker and Industrial Adhesive Guide. For medium-strength threadlocker specifically, see the Loctite 243 Guide. Need o-rings? The AIMS O-Ring range includes nitrile, Viton, EPDM, silicone and PTFE compounds. People Also Ask — Loctite 401 Instant Adhesive Q: How fast does Loctite 401 cure? On steel and aluminium, Loctite 401 achieves fixture strength in under 5 seconds at 22°C and 50% relative humidity. Full chemical and solvent resistance develops after 24 hours, with full strength reached between 24 and 72 hours depending on substrate and conditions. Cure is faster on porous materials (rubber, leather) and slower on glass and acidic surfaces such as some woods. Q: What surfaces does Loctite 401 not bond? Loctite 401 does not reliably bond polyethylene (PE), polypropylene (PP), PTFE, or silicone rubber without a surface primer. It also bonds poorly to oily or contaminated surfaces, and gaps over approximately 0.1 mm will significantly reduce strength as cyanoacrylate requires close contact to cure. Pre-treat difficult plastics with Loctite Primer SF 770 before application. Q: How should Loctite 401 be stored? Store Loctite 401 in a refrigerator between 2°C and 8°C and keep the cap tightly closed after each use. Shelf life is 12 months from manufacture when stored correctly. At room temperature, expect a shorter working life once opened. Do not freeze. Allow the bottle to reach room temperature before opening to prevent condensation from entering the applicator tip. Q: What is the difference between Loctite 401 and Loctite 406? Loctite 401 is a general-purpose medium-viscosity ethyl cyanoacrylate for metals, ceramics, and most plastics. Loctite 406 is specifically formulated for rubber and difficult plastics, with improved bonding to EPDM, neoprene, and polycarbonate. If bonding rubber or soft plastics is the primary application, use 406. For mixed-substrate production or maintenance work, 401 is the more versatile option. Q: Can Loctite 401 withstand heat? Loctite 401 maintains meaningful bond strength up to approximately 80–90°C in continuous service. For short-term or peak exposure, strength is retained to around 120°C before significant reduction. For elevated-temperature applications above 80°C, consider Loctite 4014 or 4061, which are cyanoacrylate grades with higher heat resistance, or switch to an epoxy adhesive for sustained high-temperature service.
Read moreThread Locking & Sealing: Loctite, PTFE & Anaerobic Sealant Guide
Thread locking and thread sealing are not the same thing — they solve different problems with different products, and using the wrong one for the job.
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Loctite Application Guide: Which Grade & When to Use It
Loctite Grade Selector — Match Product to Job This guide is a working Loctite selector. Use the cards below to land on the right grade fast — every grade mentioned in the article body also links to its specific AIMS product page. How to use: 1. Match the job profile (threadlock, sealant, retaining, adhesive) 2. Click the grade to view AIMS stock 3. Use the application section below for technique Low-Strength Threadlock Loctite 222 — small fasteners, removable 222 View → Medium-Strength Threadlock Loctite 243 — workshop default 243 View → High-Strength Threadlock Loctite 263 / 271 — permanent / vibration 263/271 View → Pipe Thread Sealing Loctite 567 / 569 / 577 — anaerobic 567/577 View → Bearing Retaining Loctite 638 / 641 — slip-fit retaining 638 View → Gasket Eliminator Loctite 518 / 510 / 587 / 596 518/596 View → Instant Adhesive (CA) Loctite 401 / 406 / 480 401/406 View → Anti-Seize / Surface Prep Loctite Copper Anti-Seize + 7649 Primer Anti-Seize View → Quick rule of thumb: Loctite anaerobics cure where there's metal + absence of oxygen. Low-strength (222) = removable. Medium-strength (243) = workshop default. High-strength (263/271) = permanent / heat-required to remove. AIMS stocks the full Loctite anaerobic + instant adhesive + sealant + activator range. Need help? Call (02) 9773 0122. Jump to: Which Loctite? Quick Chart Threadlockers Thread Sealants Retaining Anti-Seize Surface Prep Removing Instant Adhesives Related Which Loctite do I use? Loctite threadlockers are colour-coded by strength: blue (Loctite 242 / 243) for medium-strength fasteners you'll need to remove later, red (Loctite 262 / 271 / 277) for permanent high-strength fasteners that stay put, and green (Loctite 290) for wicking into pre-assembled threads. Loctite also makes thread sealants (567 / 577 for tapered pipe threads), retaining compounds (603 / 638 for bearing fits), and instant adhesives (401 / 406 cyanoacrylates). What is Loctite 243 used for? Loctite 243 is a medium-strength blue threadlocker for fasteners between M6 and M20 that you may need to remove later with hand tools. It tolerates light oil contamination on the threads, cures in around 10 minutes to handling strength, and reaches full strength in 24 hours. Typical uses: vehicle suspension bolts, pump and motor fixings, machinery hold-downs, gearbox fasteners. Need another reference chart? Browse the full AIMS Engineering Reference Charts library — drill bit sizes, tap drill, torque, viscosity, GD&T, AS/NZS standards and more. Loctite Quick Selection Chart For threadlocking on small fasteners use Loctite 222 (purple); medium-duty fasteners Loctite 243 (blue); high-strength permanent Loctite 263 or 271 (red). For pipe sealing use Loctite 567 or 577. For retaining compounds use Loctite 638, 641 or 648. Full grade-by-grade detail below. Grade Type / Colour Use For 222 Threadlocker — Purple, low strength Small screws M1.4–M6, grub screws, instruments 243 Threadlocker — Blue, medium strength General fasteners M6–M20, hand-tool removable 263 / 271 Threadlocker — Red, high strength Permanent fasteners — heat required to remove 567 Thread sealant — White Fine hydraulic and pneumatic threads 577 Thread sealant — Yellow BSP and NPT pipe threads, gas, water, oil 638 Retaining compound — High strength Close-tolerance bearing retention 641 Retaining compound — Medium strength Standard bearing / bushing retention 648 Retaining compound — Maximum strength Permanent high-temp cylindrical assemblies 401 Instant adhesive — Cyanoacrylate General-purpose bonding of metal, rubber, plastic 480 Instant adhesive — Toughened CA Impact-resistant rubber and metal bonds What Are Loctite Anaerobic Products? Loctite's industrial range is built on anaerobic chemistry — adhesives and sealants that remain liquid in air but cure rapidly when trapped between two close-fitting metal surfaces in the absence of oxygen. The metal ions in the substrate initiate polymerisation, converting the liquid into a hard thermoset plastic that resists vibration, leakage and corrosion. When stripping a stubborn old anaerobic threadlocker bond, mechanical heat is the standard release method — but for plastic-bodied components where heat is risky, the contrast-cooling trick from our freeze spray guide can shock-fracture cured threadlocker without damaging the surrounding plastic. Quick answer — Loctite grades by job Threadlockers (anaerobic, prevent vibration loosening): 222 low strength (small screws, removable) · 242/243 medium strength (general purpose, blue) · 263/271/277 high strength (permanent, red) · 248 stick form Instant adhesives (cyanoacrylate / super glue): 401 general purpose · 406 rubber/plastic specialty · 414 metals · 480 toughened impact-resistant · 435 low-blooming clear Thread sealants (anaerobic, pipe thread leaks): 567 stainless/coarse (white) · 577 general pipe (yellow, faster cure) · 542 hydraulic fine threads · 545 general purpose Retaining compounds: 603 oil-tolerant · 638 high strength, high temp · 648 high temp, fast cure · 680 slip-fit highest strength This guide covers every industrial Loctite product family relevant to maintenance, engineering and trade work in Australia: threadlockers (preventing fastener loosening under vibration), thread sealants (sealing pipe and hydraulic fittings), and retaining compounds (locking bearings, bushings and cylindrical assemblies). It includes full selection charts, application guides, cure time data, surface preparation requirements and removal instructions — plus a FAQ section that answers the most common grade comparison questions. Browse the full AIMS Industrial Loctite range — threadlockers, thread sealants, retaining compounds and primers stocked for fast Australia-wide dispatch. Loctite Threadlockers: Grades, Colours and Selection Threadlockers prevent fasteners from loosening under vibration, thermal cycling and dynamic load. They fill the microscopic gaps between mating threads, locking out corrosion and sealing against fluid ingress at the same time. Selecting the wrong grade — typically using red where blue is correct, or blue where purple is required — is the most common installation mistake, and can make fasteners impossible to remove without heat or damage the threads on small screws. The Loctite Colour and Strength System Every Loctite threadlocker is colour-coded by strength. The colour tells you immediately whether the fastener can be released with standard hand tools or whether heat will be required for removal. Colour Strength Level Removability Common Grades Purple Low Hand tools — easily removable 222 Blue Medium Hand tools — standard spanners and sockets 242, 243 Red High / Permanent Heat required — 250°C before applying torque 262, 263, 271, 272, 277 Green Low to High (wicking grades) Depends on grade — see table below 270, 290 Loctite Threadlocker Grade Comparison Chart Grade Colour Strength Bolt Size Max Temp Removable? Primary Application 222 Purple Low M1.4–M6 150°C Yes — hand tools Small screws, grub screws, instrument hardware, adjustment fasteners 242 Blue Medium M6–M20 150°C Yes — hand tools General purpose — older formulation; performs identically to 243 on clean threads 243 Blue Medium M6–M20 150°C Yes — hand tools General purpose standard — improved oil tolerance over 242; preferred current-generation grade 262 Red High M6–M20 150°C Heat required (250°C) Studs, press-fit bolts, high-vibration assemblies — smaller fasteners than 263 263 Red High M6–M36 150°C Heat required (250°C) Large permanent fasteners — higher breakaway torque than 262; structural joints 270 Green High M6–M36 150°C Heat required Wicking grade — penetrates pre-assembled joints; post-assembly application 271 Red High M6–M36 150°C Heat required (250°C) High-strength general purpose — wheel bolts, studs, structural and safety-critical fasteners 272 Red High M6–M36 230°C Heat required High-temperature applications — exhaust manifold studs, engine components, hot environments 277 Red Very High M20–M36+ 150°C Heat required Very large fasteners — maximum breakaway torque for flanges, heavy plant, large structural bolts 290 Green Medium M6–M20 150°C Yes — hand tools Wicking grade — post-assembly on pre-assembled or production-line fasteners; medium strength Loctite 242 vs 243 — What Changed? Loctite 243 is the current-generation replacement for 242. Both are medium-strength blue threadlockers for M6–M20 fasteners, and both develop the same cured strength on clean, degreased steel. The key improvement in 243 is better tolerance to light oil contamination on threads. In a workshop environment where threads are occasionally oily, 243 cures reliably where 242 may underperform. If you have 242 on the shelf, use it — it is equivalent to 243 on clean surfaces. For new stock, specify 243. Loctite 243 vs 263 — The Most Important Distinction This is the most common and consequential selection decision. The choice is simple: will this fastener ever need to be removed? Use 243 (blue) when the fastener may need to be removed for service, adjustment or replacement. Under vibration, 243 provides equivalent security to red — it will not self-loosen. But a standard spanner or socket applied with normal force will break the bond. This is the correct grade for brake caliper bolts, suspension components, machinery access panels, and any fastener in the service path. Use 263 or 271 (red) when the assembly is permanent — a structural joint, a stud that will never be pulled, or a high-vibration application where even low probability of movement is unacceptable. These grades require heating to 250°C before the fastener can be turned. Using red on a service fastener, or on a small bolt where that heat cannot be applied safely, is the most common Loctite misapplication on the workshop floor. Threadlocker Application Selection Guide Application Recommended Grade Reason Small adjustment screws, grub screws, M1.4–M6 222 (Purple) Low strength only — blue or red on small threads risks stripping or irreversible locking General fasteners requiring future service access, M6–M20 243 (Blue) Medium strength, hand-tool removable, the standard industrial choice Brake caliper bolts 243 (Blue) Service access required; OEM specification for most passenger and light commercial vehicles Wheel spacer bolts 243 (Blue) Vibration resistance with removability for tyre changes and wheel service Bicycle and bike component bolts 222 (Purple) Critical — titanium and aluminium threads cannot handle medium or high strength; purple only Flywheel bolts, ring gear bolts 263 or 271 (Red) Permanent structural joint; high vibration; rarely or never removed in service life Exhaust manifold studs, turbo bolts 272 (Red) High-strength with 230°C continuous service temperature — the only threadlocker rated for exhaust temperatures Pre-assembled joints — wicking application 290 (Green, medium) or 270 (Green, high) Low viscosity penetrates assembled threads via capillary action — apply externally after assembly Large structural fasteners M20 and above 277 (Red) Maximum breakaway torque for large thread engagement in heavy plant and structural applications Stainless steel fasteners into stainless 243 + Loctite 7649 Activator N Passive metal — requires activator for reliable cure; see surface preparation section below Stainless Steel, Aluminium and Other Passive Metals Loctite anaerobic products cure by reacting with the metal ions present in the substrate. Passive metals — stainless steel, aluminium, titanium, zinc plating, cadmium plating — have an oxide layer that slows or prevents this reaction. On stainless-to-stainless assemblies without treatment, cure may be incomplete, slow (days rather than hours), or fail entirely in cold conditions. The solution is Loctite 7649 Activator N: apply a thin coat to one mating surface, allow 30–60 seconds to dry, then apply the Loctite threadlocker to the other surface and assemble normally. The activator overcomes the passive layer and initiates rapid, complete cure. This step is not optional on stainless — it is the difference between a joint that works and one that fails at the worst moment. Loctite Thread Sealants: Pipe, Hydraulic and Gas Applications Thread sealants seal tapered and parallel pipe threads against leakage of fluids and gases under pressure. They are a distinct product family from threadlockers — they are formulated for sealing pipe thread profiles (BSP, NPT, metric parallel), not for retaining standard bolts and fasteners. Product Type Max Pressure Max Temp Potable Water Best For Loctite 55 Sealing cord (PTFE alternative) 80 bar (gas) / 100 bar (liquid) −50°C to +130°C Yes — NSF 61 certified Gas, water, hydraulic; plastic and metal threads; instant pressure resistance on assembly Loctite 542 Anaerobic liquid 350 bar −65°C to +150°C No Fine metal hydraulic threads — instrumentation fittings, precision pneumatic connections Loctite 567 Anaerobic liquid 690 bar −65°C to +150°C No Metal pipe threads — hydraulic, pneumatic, fuel and oil systems; fine thread forms Loctite 577 Anaerobic liquid 400 bar −55°C to +150°C No Coarser BSP and NPT metal pipe threads — compressed air, water, oil and gas plumbing Loctite 55 — The PTFE Thread Seal Alternative Loctite 55 is not an anaerobic liquid — it is a continuous-filament sealing cord wound around threads by hand, replacing PTFE tape. Wound clockwise around the male thread (three to five turns for most fittings), it creates an immediate, compliant seal that develops full holding strength as the fitting is tightened. Its key advantages over PTFE tape: it can be hand-tightened to immediate pressure resistance with no cure wait; it works reliably on both metal and plastic fittings; it does not shred or delaminate into pipework; and it can be repositioned slightly after assembly if alignment is needed. Most importantly for Australian trade and construction applications, Loctite 55 is NSF 61 certified for potable water — it is the correct Loctite product for drinking water connections. It is also approved for gas service and is used on residential and commercial gas fittings where threaded connections are required. Loctite 567 vs 577 — Which Anaerobic Thread Sealant? Both 567 and 577 are anaerobic liquids that seal metal pipe threads. The difference is viscosity and thread form. Loctite 567 is lower viscosity — it wicks easily into fine hydraulic and pneumatic thread forms (SAE, metric fine), making it the correct choice for instrument fittings, hydraulic block connections and precision pneumatic assemblies where thread tolerances are tight. Loctite 577 is higher viscosity — it stays in place on coarser BSP and NPT threads during assembly, making it the standard choice for compressed air systems, water fittings and general industrial plumbing. If in doubt on a BSP fitting, use 577. If connecting hydraulic instrument tubing or fine metric threads, use 567. For cure times, fluid compatibility, passive metal guidance and a full application guide, see our Loctite 577 Thread Sealant Guide. Loctite Retaining Compounds: Bearing and Cylindrical Assembly Retaining compounds bond cylindrical assemblies — shaft-to-bearing, shaft-to-hub, pin-to-bore — by filling the microscopic clearance between components and polymerising into a rigid, load-bearing joint. They are used to augment or replace interference fits, to prevent fretting corrosion in light-clearance assemblies, and to salvage worn bores where a bearing has become loose in its housing. The two critical selection variables are the radial clearance between the mating components and the strength required. Using a product with a maximum clearance smaller than the actual gap will result in incomplete fill and significantly reduced bond strength. Grade Strength Max Clearance Max Temp Re-assemble? Best For 609 Low 0.10 mm 150°C Yes — press or hand Light-duty retention, small close-tolerance assemblies requiring re-use 638 High 0.15 mm 150°C With press or puller Close-tolerance bearing retention — maximum strength where fit is tight 641 Medium 0.25 mm 150°C Yes — press or puller Standard bearing and bushing retention — strength with serviceability 648 Maximum 0.15 mm 175°C Effectively no Permanent high-temperature assemblies where disassembly is never required 660 High 0.50 mm 150°C With press or puller Worn bore salvage — fills large clearances in worn housings and shafts 680 High 0.35 mm 150°C With press or puller General-purpose medium-to-large clearance bearing retention Choosing Between 638, 641 and 648 For new bearings in a correctly toleranced housing, 641 is the default choice. Medium strength, 0.25 mm maximum clearance, and removable with a standard bearing puller or hydraulic press — this covers the vast majority of bearing retention applications in industrial and agricultural equipment. Use 638 when the fit is very close and maximum strength is required. In a tight housing where interference fit alone is nearly sufficient, 638 augments the fit to create an exceptionally strong, permanent joint. Note that 638 in a tight bore with a light press fit is very difficult to disassemble — treat it as semi-permanent. Use 648 only when the assembly will never be disassembled and operating temperatures exceed 150°C. Loctite 648 is the most thermally resistant retaining compound and produces the highest bond strength in the range — but the joint is effectively destroyed on any attempt at disassembly. Reserve it for permanent high-temperature applications such as motor shaft assemblies in hot environments. For worn bores where the bearing is loose in the housing (clearance beyond 0.25 mm), use 660. It fills gaps up to 0.5 mm, locks the bearing in the oversized bore, and restores the housing to service without machining. This is the most commonly used retaining compound in field service and overhaul environments where worn machinery is being returned to service. Browse AIMS Industrial's full Loctite retaining compound range including 638, 641, 648 and 660. Loctite Anti-Seize Anti-seize does the opposite of a threadlocker. Where threadlockers lock fasteners in place by filling the thread void, anti-seize prevents fasteners from seizing, galling and corroding in ways that make them impossible to remove. Never apply both to the same fastener. Loctite C5-A Copper Anti-Seize is the industrial standard — a copper-based paste rated to 980°C. Correct applications include stainless-on-stainless assemblies where galling is a risk (anti-seize is far more effective than threadlocker at preventing galling), exhaust bolts and manifold studs subject to repeated heat cycling, fasteners in corrosive environments such as marine, chemical plant and agricultural equipment, and any assembly where long-term disassembly is essential. Important torque note: Anti-seize reduces the friction coefficient of threads. If torquing to a manufacturer specification designed for dry or lightly oiled threads, the torque value must be reduced when anti-seize is applied — typically by 20 to 25%. Applying full dry-thread torque with anti-seize present will over-stress the fastener. Surface Preparation: The Critical Step Loctite anaerobics cure by reacting with metal ions in the substrate. Surface contamination — oil, grease, coolant, cutting fluid, rust preventative — inhibits this reaction and reduces cured strength. Inadequate surface preparation is the primary cause of Loctite application failures. Standard preparation for all Loctite anaerobic products: Degrease both mating surfaces with Loctite 7063 cleaning solvent or isopropyl alcohol. Apply solvent, agitate if necessary to remove oil film, and allow to evaporate fully — do not assemble onto wet surfaces. On threaded fasteners, apply solvent to the bore threads and the bolt shank and allow to dry before applying Loctite. For passive metals (stainless steel, aluminium, titanium, zinc, cadmium plating): Apply Loctite 7649 Activator N to one surface and allow 30–60 seconds to dry before applying the Loctite product to the other surface. This step is not optional — without activator on stainless steel, cure is unreliable, particularly at temperatures below 15°C. The activator is low-cost and eliminates a significant failure mode. Cure Time Reference Product Type Grade Handling Strength (steel, 22°C) Full Cure Low-strength threadlocker 222 10 minutes 24 hours Medium-strength threadlocker 242, 243 10 minutes 24 hours High-strength threadlocker 262, 263, 271 20 minutes 24 hours High-temp threadlocker 272 20 minutes 24 hours (full high-temp rating requires post-cure at 120°C for 30 min) Wicking threadlocker 270, 290 15 minutes 24 hours Standard retaining compound 638, 641 10–15 minutes (fixture) 24 hours High-temp retaining compound 648 15 minutes (fixture) 24 hours (post-cure at 120°C recommended for full performance) Thread sealant 567, 577 Immediate pressure resistance 24 hours full cure Cold temperature note: Below 10°C, all cure times extend significantly — allow 48 to 72 hours for full cure in cold conditions. Cure can be accelerated to near-full strength by warming the assembled joint to 80°C for 30 minutes. On passive metals without activator, add 50% to all cure time estimates. Removing Loctite Threadlocker The correct removal method for any Loctite threadlocker — blue or red — is heat. Apply a heat gun or torch to bring the joint to approximately 250°C, then apply torque to the fastener immediately while the joint is still hot. The cured Loctite softens above this temperature and releases. Do not heat the joint and then allow it to cool before attempting removal — the Loctite will re-harden and lock the fastener again. Blue (medium strength) threadlocker: Heat to 250°C is effective but not always required. Strong, steady hand-tool force will release most blue-locked joints without heat. If a blue-locked fastener resists standard hand tool force, apply heat before increasing effort — forcing a locked fastener with an extension bar risks breaking the bolt or stripping the thread rather than releasing the Loctite. Red (high strength) threadlocker: Heat is not optional. Do not attempt to remove a red-locked fastener with hand tools alone — the breakaway torque exceeds what hand tools can safely apply on most bolt sizes. Apply direct heat to the joint, apply torque immediately while hot, and repeat the heat-and-torque cycle if the fastener does not break free on the first attempt. Aluminium and composite components: Use a heat gun rather than a torch to avoid warping or heat-damaging the surrounding material. Apply heat gradually and test the fastener for movement frequently rather than applying maximum heat in one go. If heat risks damaging adjacent components, soak the joint overnight with a penetrating oil to assist, then apply minimum heat to break free. After removal: Clean old Loctite from threads with a wire brush and solvent before re-applying fresh product. Do not re-apply new Loctite over hardened residue — the cured material does not dissolve or re-activate. Loctite Instant Adhesives: 401, 406 and the Cyanoacrylate Range Loctite's cyanoacrylate (CA) range — commonly called instant adhesives or superglue — are chemically distinct from the anaerobic products above. They cure by reacting with surface moisture rather than requiring the absence of oxygen or metal ions, and they are not suitable for thread locking, pipe sealing or cylindrical retention. Loctite 401 is the standard-viscosity general-purpose CA adhesive. It bonds metal, rubber, rigid plastics and most hard materials in seconds. For most instant adhesive applications in a trade or industrial workshop, 401 is the correct starting choice. See our Loctite 401 complete guide for full substrate compatibility, cure times and storage information. Loctite 406 is formulated for difficult substrates — polyolefin plastics (polyethylene, polypropylene), rubbers and elastomers that standard CA adhesives cannot reliably bond. It contains a surface-insensitive primer agent that promotes adhesion on low-energy surfaces. For bonding rubber seals to metal housings, or joining PP and PE components, 406 is significantly more reliable than 401. Loctite 454 is a gel-form CA that stays in position on vertical surfaces and fills small gaps — the correct choice where a liquid adhesive would run before the joint is closed, or where mating surfaces are slightly rough or porous. Loctite 480 is a rubber-toughened CA for applications requiring a flexible, impact-resistant bond — rubber-to-rubber and rubber-to-metal joints where a rigid brittle bond would crack under flexing. Loctite Product Equivalents The most frequently searched Loctite equivalent products come from the Permatex range. The approximate equivalents for the main industrial grades are: Loctite Grade Permatex Equivalent Notes 222 — Purple, low strength Permatex 24010 Functionally equivalent; verify application torque values independently 243 — Blue, medium strength Permatex 24200 Direct equivalent for general-purpose medium-strength applications 271 / 263 — Red, high strength Permatex 27200 High-strength equivalent; verify temperature ratings for your specific application When substituting between brands, always confirm that the equivalent grade meets your specific temperature, gap clearance and torque requirements — equivalent strength does not guarantee identical performance in all conditions. Lock it. Seal it. Trust it. Related AIMS Selectors This selector pairs with AIMS's other fastener & adhesive guides: Loctite 222 Guide — purple low-strength threadlocker deep-dive. Loctite 243 Guide — medium-strength workshop default. Loctite 401 Guide — instant adhesive (cyanoacrylate). Loctite 577 Guide — medium-strength thread sealant. Thread Locking & Sealing Guide — anaerobic chemistry + application technique. Industrial Adhesive Types Guide — broader adhesives hub: epoxy, RTV, structural. How to Remove Stuck Bolts & Nuts — when Loctite has done its job too well. Metric Bolt Torque Chart — torque values per grade and size. Or browse the full Loctite range, threadlockers, retaining compounds, gasket sealants, thread sealants, activators, cleaners & primers. Next-day Australia-wide dispatch from our Milperra warehouse. Shop the full Loctite range — threadlockers, retaining compounds & sealants From Loctite 222 low-strength to 263 high-strength threadlocker, 641 retaining compound, and 55 pipe sealant — AIMS Industrial is an authorised Loctite stockist with the full range available for fast Australia-wide dispatch. Shop Loctite at AIMS Talk to a specialist Frequently Asked Questions What is the best Loctite threadlocker for small screws?Loctite 222 (purple) is the only correct choice for screws up to M6. Small threads — grub screws, electronics fasteners, instrument hardware, adjustment screws — do not have sufficient thread engagement to handle the breakaway torque of medium or high-strength threadlocker. Applying blue (243) to an M3 or M4 grub screw will very likely make it impossible to remove without damaging the threads or the housing. Use purple (222) for anything M6 and smaller, without exception. What is the difference between blue and red Loctite?Blue Loctite (243) is medium strength and removable with hand tools — the standard choice for fasteners that need to be serviced, adjusted or replaced in the future. It will not self-loosen under vibration, but a spanner or socket applied with normal force will release it. Red Loctite (263, 271) is high strength and permanently locks the fastener — it requires heating the joint to 250°C before any torque will release it. The correct rule: if the fastener may ever need to come off, use blue. If it is a truly permanent structural joint, use red. Which Loctite threadlocker is the strongest?In the standard threadlocker range, Loctite 277 (red) has the highest breakaway torque and is formulated for large-diameter fasteners (M20–M36+). For the M6–M36 range, Loctite 263 and 271 provide effectively equivalent maximum strength for most applications. Loctite 648 is the maximum-strength retaining compound for cylindrical assemblies, though it serves a different function. For most industrial work, 271 or 263 provide more than sufficient permanent locking strength. Can Loctite cure on oily or contaminated threads?Standard threadlocker grades (242, 263) require clean, degreased surfaces for full strength development. Loctite 243 is formulated with improved oil tolerance and will cure acceptably on lightly oiled threads. On heavily contaminated or wet surfaces, no anaerobic product will achieve full strength — clean first. For post-assembly applications where disassembly is not practical, a wicking grade (290 for medium strength, 270 for high strength) applied to the external thread after cleaning the exposed surface will penetrate and lock the joint, but ultimate strength depends on the cleanliness of the thread interface. Can Loctite threadlocker be used on plastic threads?Anaerobic threadlockers require metal ions to cure and are formulated for metal-to-metal contact. On plastic threads, cure is unreliable, strength is substantially reduced, and certain Loctite formulations can stress-crack specific plastics — notably polystyrene and polycarbonate. For sealing plastic pipe fittings, use Loctite 55 sealing cord — it works on plastic threads without chemical incompatibility risk. For retention on plastic fasteners, mechanical solutions (nylon insert nuts, serrated flange fasteners) are more reliable than chemical threadlockers. Are Loctite thread sealants suitable for potable water pipes?Loctite 55 sealing cord is NSF 61 certified for potable water and is the correct Loctite product for any fitting in contact with drinking water. The anaerobic liquid sealants — 567 and 577 — are not NSF 61 certified and must not be used on potable water connections. For gas pipe connections (residential and commercial), Loctite 55 is also approved and is used on threaded gas fittings in Australia. It replaces PTFE tape in these applications with no need for cure time before pressurisation. How long does Loctite threadlocker take to fully cure?On clean steel at 22°C, most grades reach handling strength in 10–20 minutes — sufficient to torque the fastener and move the assembly without disturbing the joint. Full cure takes 24 hours. Below 10°C, cure times extend significantly — allow 48 to 72 hours at low temperatures. Cure can be accelerated by heating the assembled joint to 80°C for 30 minutes. On passive metals (stainless steel, aluminium) without activator, add at least 50% to all cure times and treat handling strength with caution. How do I remove a bolt locked with red Loctite threadlocker?Heat the joint directly to approximately 250°C using a heat gun or butane torch, then apply torque to the fastener immediately while it is still hot. The cured Loctite softens at this temperature and allows the fastener to turn. Do not heat the joint and then allow it to cool before trying — the Loctite re-hardens on cooling. If the fastener does not release on the first attempt, re-apply heat and try again. Never use an impact wrench on a locked fastener without heating first — the risk of shearing the bolt is significantly higher than the effort of applying heat. What is the difference between Loctite 567 and 577 thread sealant?Both are anaerobic liquids for sealing metal pipe threads. Loctite 567 is lower viscosity — it wicks easily into fine thread forms (SAE hydraulic fittings, metric fine, instrument connections) and is the correct choice for hydraulic and pneumatic precision connections. Loctite 577 is higher viscosity and stays in position on coarser BSP and NPT pipe threads during assembly. For most compressed air, water and gas plumbing on BSP fittings, 577 is the standard choice. For hydraulic block connections and instrument fittings with fine thread forms, use 567. See our full Loctite 577 Thread Sealant Guide for the complete application reference. Which Loctite retaining compound should I use for bearing retention?For standard bearing retention with normal bore clearance, Loctite 641 is the default choice — medium strength, handles clearances up to 0.25 mm, and the bearing can be removed with a press or standard puller for service. Use Loctite 638 for close-tolerance fits requiring maximum bond strength. Use Loctite 660 for worn bores with clearance above 0.25 mm — it fills gaps up to 0.5 mm and locks a loose bearing in an oversized housing without machining. Reserve Loctite 648 for permanent high-temperature assemblies that will never be disassembled. What is the difference between Loctite 401 and 406?Loctite 401 is a standard-viscosity cyanoacrylate (instant adhesive) for general bonding of metal, rubber and most rigid plastics. Loctite 406 is formulated specifically for difficult low-energy substrates — polyolefin plastics (polyethylene, polypropylene) and elastomers that standard CA adhesives cannot reliably bond. If you're bonding rubber gaskets, polypropylene fittings or PE components, 406 is the correct grade. For metal-to-metal, glass-to-metal or general rigid bonding, 401 is sufficient. The 406 premium is only justified where the substrate is a known adhesive-resistant plastic or rubber. For metric bolt diameter, pitch and head dimensions from M3 to M24, see our Metric Bolt Size Guide. People Also Ask — Loctite Grade Selection Q: What is the difference between Loctite 243 and Loctite 263? Loctite 243 is a medium-strength threadlocker removable with hand tools after cure — suitable for most fasteners M6 to M20 where future disassembly is expected. Loctite 263 is high-strength and permanently bonds fasteners; removal requires heat above 250°C. Use 243 for routine maintenance, 263 where vibration risk is severe and disassembly is not planned. Q: How long does Loctite threadlocker take to cure? Loctite 243 achieves handling strength in approximately 10 minutes on steel at 22°C. Full chemical cure takes 24 hours. Cure is slower on passive metals (stainless steel, zinc) and in cold conditions — allow extra time before applying service loads. Activator SF 7649 speeds cure on passive metals. Q: Can you use Loctite on aluminium threads? Yes. Loctite anaerobic threadlockers including Loctite 222, 243, and 263 are compatible with aluminium. Aluminium is a passive metal, so cure is slower than on steel. Apply Loctite Activator SF 7649 to one thread surface first to achieve reliable cure speed and strength on aluminium fasteners. Q: What Loctite grade is best for stainless steel fasteners? Loctite 243 medium-strength or Loctite 263 high-strength both work on stainless steel, but stainless is a passive metal — always apply Activator SF 7649 first. For stainless fasteners in food or hygienic environments, Loctite 2400 is a water-washable, low-odour alternative approved for incidental food contact. Q: What is Loctite 577 used for? Loctite 577 is a medium-strength thread sealant for parallel (BSP) threads used in hydraulic and pneumatic systems. It seals metal-to-metal pipe threads and fitting connections against fluid and gas leakage up to 150 bar, while remaining removable with hand tools for maintenance. Not a threadlocker — designed specifically for fluid-system thread sealing. Looking for anti-vibration mounts? Our anti-vibration mounts range covers the common sizes and brands. Looking for anti-seize compounds? Our anti-seize compounds range covers the common sizes and brands.
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