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) |
0.1 |
|
Specific Heat, kJ/(kg·K) |
0.3 |
|
Adhesive Properties |
|
|
After 24 hours @ 22 °C Compressive Shear Strength, ISO 10123 Steel pins and collars |
N/mm² ≥6.5 LMS (psi) (940) |
