Loctite 5770 Thread Sealant

Seals steam joints — tested on forged steel fittings with 280°C steam at 6.4 MPa. Medium strength — locks threads against shock and vibration, removable with hand tools. Resists oils, ATF, petrol, brake fluid, glycol, biodiesel and AdBlue once cured. Loctite 5770 is a thixotropic anaerobic paste for locking and sealing metal threaded pipes and fittings in industrial plant, particularly steel steam piping. Allow at least 24 hours for full pressure and solvent resistance, and use Activator SF 7471 or SF 7649 on inactive metals.

Product: Loctite 5770 High Temperature Thread Sealant. Size: 50 ml. Technology: acrylic, anaerobic. Chemical type: dimethacrylate ester. Appearance: off-white to purplish grey paste. Strength: medium. Cure: anaerobic; Activator SF 7471 or SF 7649 as secondary cure. Viscosity (cone and plate, 25°C): 30,000–90,000 mPa·s, thixotropic. Specific gravity (25°C): 1.27. Breakloose torque (ISO 10964, 3/8 x 16 steel, 24 hours): 9.0–28.4 N·m. Removal torque (ASTM D6396, 3/8 NPT malleable iron tees and steel plugs, 72 hours): 74 N·m. Steam resistance: 280°C at 6.4 MPa, tested on forged steel fittings. Full cure: minimum 24 hours. Storage: 8°C to 21°C, dry. Consult the Safety Data Sheet before use.

At a glance

• Steam piping — sealing threaded steel pipe and fittings at high temperature
• Boiler and process plant — high-pressure threaded connections
• Hot oil and ATF lines — threaded fittings exposed to heat and oil
• Industrial fluid systems — locking and sealing metal pipe threads against vibration

Full specifications, applications, features and important limits are in the tabs below.