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Features and Benefits

High strength, methacrylate ester-based retaining compound that is slow curing; ideal for large diameter components and active metals such as brass.
LOCTITE® 640 is a green, anaerobic, low viscosity, methacrylate ester-based retaining compound ideal for parts requiring a longer positioning time. Fixturing time on steel is 2 h. Also used for active metals such as brass. This is a high strength product with good temperature resistance. Max. diametrical clearance is 0.1 mm and service temperature is -55 to +175ºC. Fluorescence allows product presence to be monitored.
  • 1-part product, requires no mixing
  • Slow curing
  • Ideal for large diameter components
  • Also for active metals such as brass
  • High strength
  • Good temperature resistance
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Technical Information

Chemical Basis / Base Methacrylate
Color Green
Diametrical Clearance (Maximum) 0.1 mm
Fixture Time 2 hr.
Fixture Time Temperature 2 °C
Shear Strength 22 N/mm²
Substrates Metal: Steel
Viscosity 450 - 750 mPa.s (cP) Brookfield