Loctite 5770 High Temperature Thread Sealant 50ml
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Loctite 5770 is a one-component, medium strength, anaerobic thread sealant. It is an off-white to purplish grey, thixotropic dimethacrylate ester paste for sealing and locking metal threaded pipes and fittings in industrial applications.
Henkel positions it for steel joints that need high temperature and high pressure resistance. Properly tightened fittings seal instantly to moderate pressures, and the joint can be taken apart with standard hand tools.
Where this product is used
- Sealing and locking metal threaded pipes and fittings in industrial applications
- Steel joints that need high temperature and high pressure resistance
- Threaded joints in contact with motor oil, ATF, brake fluid or water/glycol once cured (strength retention data is in the data sheet)
- Pipe threads that must be disassembled later with hand tools
Features
- Medium strength, removable with standard hand tools
- One component, no mixing; thixotropic paste
- Seals instantly to moderate pressures on properly tightened fittings
- Anaerobic cure, with Activator 7471 or 7649 as the secondary cure
- Steam resistance tested on steel steam bombs at 232 °C, 250 °C and 280 °C
- Retains strength in motor oil, ATF, gasoline, brake fluid, water/glycol, isopropanol and DEF (AdBlue)
- Allow a minimum of 24 hours to cure for maximum pressure and solvent resistance
Key specifications
| Specification | Detail |
|---|---|
| Chemical type | Dimethacrylate ester (acrylic technology) |
| Colour | Off-white to purplish grey paste |
| Strength class | Medium |
| Cure | Anaerobic; secondary cure with Activator 7471 or 7649 |
| Viscosity (cone and plate, 25 °C, 50 mm parallel plates, 0.5 mm gap, 50 s-1) | 30,000 to 90,000 mPa·s |
| Specific gravity (25 °C) | 1.27 |
| Breakloose torque (ISO 10964, 3/8 x 16 grade 5 steel nuts and bolts, degreased, 24 h at 25 °C, pre-torque 5 N·m) | 9.0 to 28.4 N·m |
| Breakloose torque (72 h at 22 °C, pre-torque 5 N·m) | Steel degreased 27 N·m; phosphate and oil as received 28 N·m |
| Prevail torque (ISO 10964, 72 h at 22 °C) | Phosphate and oil 5 N·m; steel degreased 4 N·m |
| Removal torque (ASTM D6396, 3/8 malleable iron pipe tees and steel pipe plugs, as received, 72 h at 22 °C, pre-torque 27 N·m) | 74 N·m |
| Pressure (ASTM D6396, 3/8 NPT) | Sealed at 0.69 MPa (100 psi) air pressure after 5 min cure at 22 °C |
| Steam test (steel steam bombs, cured 24 h at 22 °C + 2 h at 150 °C) | Reported as % steam weight loss, no pass/fail criterion: 232 °C / 2.9 MPa 0%, 0%, 3%; 250 °C / 4.0 MPa 0%, 0%, 2%; 280 °C / 6.4 MPa 4%, 4%, 9% (at 48 h, 7 days, 21 days) |
| Storage | 8 °C to 21 °C, unopened, dry |
| Technical data sheet | Henkel TDS April 2012 (Reference 0.2) |
Selecting the right option
Other Loctite thread sealants in the range include low strength Loctite 567 PST Low Strength Thread Sealant, medium strength Loctite 577 Medium Strength Thread Sealant and Loctite 542 Medium Strength Thread Sealant, and the hydraulic high strength Loctite 569 Low Strength Thread Sealant 50ml. Check each data sheet against your temperature and pressure before choosing.
Using it
Henkel lists Activator 7471 or 7649 as the secondary cure.
Allow the product to cure a minimum of 24 hours for maximum pressure and solvent resistance. Cure speed depends on the materials, the gap and the temperature; the cure-speed graphs are in the Henkel data sheet.
Disassemble with standard hand tools. Where hand tools do not work, for example with excessive engagement length or large diameters, apply localised heat to approximately 250 °C and disassemble while hot.
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 for plastics, as thermoplastics may stress-crack. Henkel states no maximum or operating temperature for this product, and the steam test is reported as weight loss with no pass/fail criterion, so confirm suitability for steam duty before specifying. Read the safety data sheet before use.
Frequently asked questions
What strength is Loctite 5770?
Medium. Henkel's characteristics table lists 'Strength: Medium'. Standard hand tools disassemble it; where they do not, apply localised heat to about 250 °C.
How long should I wait before pressure testing Loctite 5770?
Properly tightened fittings seal instantly to moderate pressures; Henkel's test sealed at 0.69 MPa (100 psi) air pressure after 5 minutes at 22 °C. Allow a minimum of 24 hours for maximum pressure and solvent resistance.
What fluids does Loctite 5770 resist?
After 3 days cure it retains 93 to 133% of initial strength after 1,000 h in motor oil (125 °C), ATF (87 °C), gasoline, brake fluid, water/glycol 50/50 (87 °C), isopropanol and DEF (AdBlue). E85 fuel dips to 70% at 500 h and returns to 100% at 1,000 h.
Is Loctite 5770 rated for steam?
Henkel gives no steam rating. It reports weight loss on steel steam bombs: 0% to 3% at 232 °C and 250 °C, and 4% after 48 h and 7 days and 9% after 21 days at 280 °C and 6.4 MPa. No pass/fail criterion is given.
Do I need an activator with Loctite 5770?
It cures anaerobically on its own. Henkel lists Activator 7471 or 7649 as the secondary cure.
Does Loctite 5770 have approvals?
The current Henkel data sheet lists no approvals; contact AIMS if you need a certificate for a specific application.
Related products
See also: Loctite 567 PST Low Strength Thread Sealant, Loctite 577 Medium Strength Thread Sealant, Loctite 542 Medium Strength Thread Sealant, Loctite 569 Low Strength Thread Sealant 50ml, Loctite 565 PST Thread Sealant 50ml.
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