LOCTITE® 641 is designed for the bonding of cylindrical fitting parts, particularly where disassembly is required for service operations. The product cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage from shock and vibration. Typical applications include retention of bearings onto shafts and into housings.
FEATURES AND BENEFITS
Prevents loosening: It fills all gaps between the cylindrical components and cures into a hard thermoset plastic. This unitizes the assembly and prevents loosening and leakage from shock and vibration.
Augments press fit.
Recommended for parts that will need subsequent dismantling, eg retention of bearings on shaft and into housing.
Prevents loosening and leakage from shock and vibration.
APPLICATION
Retaining
PRODUCT CHARACTERISTICS
Technology
Acrylic
Chemical Type
Methacrylate ester
Appearance (uncured)
Yellow liquidLMS
Fluorescence
Negative
Components
One component – requires no mixing
Viscosity
Medium
Cure
Anaerobic
Secondary Cure
Activator
Application
Retaining
Strength
Medium
TYPICAL PROPERTIES OF UNCURED MATERIAL
Specific Gravity @ 25 °C
1.07
Flash Point – See SDS
Viscosity, Brookfield – RVT, 25 °C, mPa·s (cP)
Spindle 2, speed 2.5 rpm 1,215 to 2,750LMS
Spindle 2, speed 20 rpm 400 to 800LMS
Viscosity, EN 12092 – MV, 25 °C, after 180 s, mPa·s (cP
Shear rate 277 s -1
90 to 180
TYPICAL PROPERTIES OF CURED MATERIAL
Physical Properties:
Coefficient of Thermal Expansion, ISO 11359-2,K^-1
80×10^-6
Coefficient of Thermal Conductivity, ISO 8302, W/(m·K)
