Loctite 680 High Strength Retaining Compound 50ml

Loctite 680 is a one-component, green, high strength anaerobic retaining compound. It is a methacrylate ester designed for the bonding of cylindrical fitting parts.

It works on active metals and on passive surfaces such as stainless steel and plated parts, and it tolerates minor surface contamination from cutting, lubrication, anti-corrosion and protection fluids. This is the 50ml pack.

Where this product is used

• Bonding cylindrical fitting parts, such as pins and collars
• Steel, stainless steel and aluminium parts (all)
• Passive surfaces such as stainless steel and plated parts
• Parts with minor oil contamination from cutting or lubrication fluids
• Assemblies released with localised heat to about 250 °C

Features

• High strength: 26 N/mm² (3,740 psi) on steel pins and collars after 7 days at 22 °C
• Medium viscosity class, 750 to 1,750 mPa·s
• Green liquid with positive fluorescence under UV light
• One component, no mixing
• Activator available to speed cure or bridge larger gaps
• Certified to ANSI/NSF Standard 61 for potable water systems not exceeding 82 °C (regional approval)
• Cold strength tested to -75 °C

Key specifications

Choosing the right option

Loctite 680 is also supplied in a larger pack: Loctite 680 High Strength Retaining Compound 250ml. For a medium strength grade see Loctite 641 Retaining Compound, and for high strength with high temperature performance see Loctite 648 High Strength, High Temperature Retaining Compound 50ml.

To accelerate cure or where large gaps are present, use an activator: Loctite 7471 Primer T Surface Preparation Activator Aerosol 133g or Loctite SF 7649 Activator for Anaerobic Adhesives 133ml.

See also: Loctite 680 High Strength Retaining Compound 250ml, Loctite 641 Retaining Compound, Loctite 648 High Strength, High Temperature Retaining Compound 50ml, Loctite 7471 Primer T Surface Preparation Activator Aerosol 133g.

Using it

Cure speed is shown as graphs run to 7 days, and depends on the materials, the gap and the temperature.

Typical strength figures are measured after 7 days at 22 °C. The minimum on steel is 19.3 N/mm² after 24 hours at 22 °C.

To disassemble, apply localised heat to approximately 250 °C and take the parts apart while hot.

Confirm compatibility first.

Storage and handling

Store unopened in a dry location, optimally between 8 °C and 21 °C. Storage below 8 °C or above 28 °C can adversely affect the properties of the product.

Limits and safety

Not recommended for pure oxygen or oxygen-rich systems, or as a sealant for chlorine or other strong oxidising materials. Not normally recommended on plastics, particularly thermoplastics where stress cracking could result; confirm compatibility. Check compatibility with aqueous washing systems. Read the safety data sheet before use.

Handling strength develops with time and depends on the substrate, the gap and the temperature; the cure-speed graphs are in the data sheet.