LORD Circalok™ 6703 thermally conductive silicone encapsulant is a two-component system designed to provide thermal conductivity for encapsulating densely packed power units.
Shelf life of each component is six months from date of manufacture when stored at 25°C in original, unopened container. The material must be periodically rotated within its container to maintain maximum shelf life. Settling will occur if not mixed.
Uncured Typical Properties**
- Low Stress – exhibits low shrinkage and stress on components as it cures.
Environmentally Resistant – provides excellent thermal shock resistance.
UL Rated – meets requirements of UL 94 V-O standard; provides excellent flame retardancy.
Mixed Appearance: Light Gray Paste
Cured Typical Properties**
Mixed Viscosity, cps @ 25°C: 8000
Mixed Specific Gravity: 2.0
Gel Time, min @ 66°C: 12 - 14
Working Life, hr @ 25°C: 1 - 2
Volume Resistivity, ohm-cm @ 25°C: 1 x 1014
Circalok 6703 A Resin - Typical Properties**
Thermal Conductivity, W/mK: 0.8
Coefficient of Linear Thermal Expansion, ppm/°C: 220
Hardness, Shore A: 60
Tensile Strength, MPa: 1.38
Elongation at Break, %: 80
Dielectric Strength, V/mil: 500
Dielectric Constant, @ 25°C: 4.25
Dissipation Factor, % @ 25°C: 0.02
Appearance: Black Paste
Circalok 6703 B Hardener - Typical Properties**
Viscosity, cps @ 25°C: 15,000
Specific Gravity: 2.09
Appearance: White Paste
Material Safety Data Sheet (MSDS):
Viscosity, cps @ 25°C: 6000
Specific Gravity: 1.91
Technical Data Sheet:
*Actual product colours may vary from on-screen and printed representations.
**Data is typical and not to be used for specification purposes.