LOCTITE 661
Harmonization Code : 3919.10.80 | Other self-adhesive plastic rolls not exceeding 20 cm wide.
Main features
- Dual Anaerobic and UV Cure
- Low-Viscosity Shaft Component Retention
- High-Strength Steel Component Retention
Product Description
LOCTITE 661 is a one-component, low-viscosity urethane methacrylate retaining compound with anaerobic and UV cure. It bonds close-fitting cylindrical metal parts and can cure either when confined without air between mating surfaces or when exposed to UV light of sufficient intensity. Typical applications include gears and sprockets on gearbox shafts and rotors on electric motor shafts. After 24 hours at 23 deg C, compressive shear strength on steel pins and collars is 15 N/mm^2 per ISO 10123. Glass microscope slides reach fixture strength in 14 seconds under UV light at 6 mW/cm^2 measured at 365 nm.
Key features
- Dual cure mechanism: Combines anaerobic cure in confined metal interfaces with UV-light cure.
- Fast UV fixture: Glass microscope slides reach fixture strength in 14 seconds at 6 mW/cm^2 measured at 365 nm.
- Shaft component retention: Typical uses include gears, sprockets and motor-shaft rotors.
Applications
Retaining gears and sprockets on gearbox shafts and rotors on motor shafts.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Other Properties
Thermal Properties
Additional Information
As supplied
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Specific gravity | 1.1 | 23 deg C | |
| Viscosity | 500 | mPa s | Brookfield RVT; spindle 3; 20 rpm; 25 deg C |
| Viscosity | 450 | mPa s | Cone and plate; 25 deg C; 129 s^-1 shear rate; after 180 seconds |
Cured material
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Coefficient of thermal expansion | 80 x 10^-6 | K^-1 | ISO 11359-2; cured 24 hours at 23 deg C |
| Thermal conductivity | 0.1 | W/(m K) | ISO 8302; cured 24 hours at 23 deg C |
| Specific heat | 0.3 | kJ/(kg K) | Cured 24 hours at 23 deg C |
| Compressive shear strength | 15 | N/mm^2 | ISO 10123; steel pins and collars; cured 24 hours at 23 deg C |
