LOCTITE 4981
Harmonization Code : 3907.30.00.40 | Epoxy Mold Compounds containing by weight more than 70 % silicon dioxide
Main features
- Heat-Resistant Instant Bonding
- Thermal-Cycling and Humidity Resistance
- Rapid Multi-Substrate Fixturing
Product Description
LOCTITE 4981 combines one-part ethyl cyanoacrylate chemistry with medium-viscosity flow for instant bonding of rubber, plastic and metal assemblies requiring heat resistance. Its colorless to pale-yellow liquid form has a typical viscosity of 400 to 600 mPa s at 25 deg C and cures through atmospheric humidity. The grade resists thermal cycling and humidity, while fixture times under specified conditions range from 2 to 10 seconds on aluminum and 5 to 10 seconds on ABS. Cured steel lap-shear data cover room-temperature and elevated-temperature conditions.
Key features
- Heat-resistant grade: Cured steel lap-shear data include testing at 121 deg C after an elevated-temperature conditioning cycle.
- Rapid fixture response: Fixture time is 2 to 10 seconds on aluminum and 5 to 10 seconds on ABS under specified conditions.
- Environmental resistance: The formulation resists thermal cycling and humidity.
Applications
Bonding rubber, plastic and metal assemblies where heat, thermal-cycling or humidity resistance is required.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Other Properties
Electrical Properties
Physical Properties
Thermal Properties
Additional Information
As-supplied / before-processing properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Appearance | Transparent, colorless to pale yellow liquid | Uncured; LMS | |
| Specific gravity | 1.1 | Typical; 25 deg C | |
| Viscosity | 400 to 600 | mPa s | Typical; Brookfield LVF; spindle 2; 30 rpm; 25 deg C |
After-processing / final-state properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Coefficient of thermal expansion | 80 x 10^-6 | K^-1 | Typical; ISO 11359-2; after 24 h at 22 deg C |
| Thermal conductivity | 0.1 | W/(m K) | Typical; ISO 8302; after 24 h at 22 deg C |
| Glass transition temperature | 120 | deg C | Typical; ASTM E 228; after 24 h at 22 deg C |
| Dielectric breakdown strength | 25 | kV/mm | Typical; IEC 60243-1; after 24 h at 22 deg C |
| Volume resistivity | 10 x 10^15 | ohm cm | Typical; IEC 60093; after 24 h at 22 deg C |
| Lap shear strength - steel | 19 | N/mm^2 | Typical; ISO 4587; grit-blasted steel; cured 24 h at 22 deg C |
| Lap shear strength at 121 deg C | >=6.9 | N/mm^2 | Typical; ISO 4587; grit-blasted steel; 24 h at 22 deg C plus 24 h at 121 deg C; tested at 121 deg C |
