Loctite 425

LOCTITE® 425™ is a fast curing, low strength cyanoacrylate adhesive designed for locking metal and plastic fasteners. It can be applied before or after assembly. It cures quickly on plated metal and plastic fasteners; fixturing is achieved in less than 2 minutes and full strength within 24 hours. It is commonly used for tamperproofing screw heads and potentiometers. It is a one-part, low viscosity, dark blue ethyl cyanoacrylate liquid that cures with atmospheric moisture. Fixture speed can be increased with a cyanoacrylate activator such as LOCTITE 7113™. Its typical operating range is −54 to 85 °C.

Typical Properties

• Specific gravity (25 °C) 1.1; viscosity (Brookfield LVF, 25 °C) 40–80 mPa·s
• Volume and surface resistivity above 1 x 10¹⁵ (Ω·cm / Ω); dielectric breakdown strength 19.7 kV/mm
• After 24 hours (22 °C, untorqued zinc plated fasteners): 10-32 breakaway torque 0.36 N·m; 3/8 x 24 breakaway and prevail torque 1.1–8.5 N·m

Use and Storage

• Surfaces should be clean and free from grease; it is suited to thin bond gaps (0.05 mm)
• Excess adhesive can be dissolved with Loctite cleanup solvents, nitromethane or acetone
• Not for use in pure oxygen or oxygen rich systems or with chlorine or strong oxidizing materials
• Store unopened in a dry place at 2–8 °C