COOLTHERM 6733
Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others
Main features
- Solvent-Free RTV Silicone Encapsulation
- Low-Stress No-Exotherm Room-Temperature Cure
- -60 to 205 deg C Continuous Service
Product Description
CoolTherm® Circalok 6733 Silicone System is the hardener component used with Circalok® 6716 Silicone Resin to create a two-component, solvent-free RTV silicone encapsulant system for potting and encapsulating low- and high-voltage electrical and electronic assemblies. The cured system provides low stress, excellent dielectric properties, room-temperature curing without hardener poisoning, and cures without exotherm, making it suitable for protecting sensitive electronic components.
Key Features
- Forms a two-component solvent-free RTV silicone encapsulant with Circalok® 6716 Resin.
- Room-temperature curing formulation that is not subject to hardener poisoning.
- Low-shrinkage, low-stress cure helps protect sensitive electronic assemblies.
- Cures without exotherm, including deep-section encapsulations.
- Provides excellent dielectric strength and electrical resistivity after cure.
- Supports continuous operating temperatures from -60°C to +205°C.
Suitable For
- Potting electrical assemblies
- Encapsulating electronic assemblies
- Low-voltage electronics
- High-voltage electronic assemblies
Technical Specifications
General Properties
Mix RatioMix Ratio
100:2.5Additional Information
As-Supplied / Before-Processing Properties
| Property | Value |
|---|---|
| Compatible Resin | Circalok® 6716 Silicone Resin |
| Mix Ratio (Resin : Hardener) | 100 : 2.5 by weight |
| Working Life | 45 minutes @ 25°C |
| Cure Time | 12–16 hours @ 25°C |
| Shelf Life | 6 months at 25°C in the original unopened container |
After-Processing / Final-State Properties
| Property | Value |
|---|---|
| Thermal Conductivity | 0.3 W/m·K (ISO 22007-2) |
| Coefficient of Thermal Expansion | 110 ppm/°C |
| Hardness | Shore A 45 |
| Tensile Strength | 0.97 MPa (140 psi) |
| Elongation at Break | 200% |
| Volume Resistivity | 1 × 1015 ohm·cm |
| Dielectric Strength | 19.7 kV/mm (500 V/mil) (ASTM D149) |
| Dielectric Constant | 3.5 @ 25°C (ASTM D150) |
| Dissipation Factor | 0.01 @ 25°C (ASTM D150) |
