COOLTHERM DC-812
Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others
Main features
- Automotive Encapsulation Application
- 1.4 x 10^16 ohm-cm Volume Resistivity
- Resistance to Thermal Shock and Electrical Stability
Product Description
Thermoset DC-812 Epoxy Encapsulant is a two-component epoxy system developed specifically for potting high-voltage automotive ignition coils. The gray resin and amber hardener are processed at a 100:46 resin-to-hardener ratio by volume using automatic meter/mix/dispense equipment. The system combines low processing viscosity at elevated temperature with a cured Shore D hardness of 90, a volume resistivity of 1.4 × 1016 ohm-cm at 25 °C, and documented resistance to thermal shock. Its cured electrical properties support encapsulation applications requiring electrical stability at elevated temperatures.
Key features
- Ignition-coil encapsulation: Developed specifically for potting high-voltage automotive ignition coils.
- High electrical resistivity: Provides a typical cured volume resistivity of 1.4 × 1016 ohm-cm at 25 °C using ASTM D257.
- Thermal-shock resistance: The cured epoxy system provides documented resistance to thermal shock and electrical stability at elevated temperature.
Applications / Suitable for
- Potting high-voltage automotive ignition coils
- Vacuum encapsulation using automatic meter/mix/dispense equipment
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Additional Information
As-supplied / before-processing properties
Typical properties of the separate components and mixed encapsulant before cure. Values are not intended for specification purposes.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Appearance | Gray liquid / amber liquid / tan liquid | — | Resin / hardener / mixed material |
| Mix ratio | 100:46 | By volume | DC-812 resin : DC-812 hardener |
| Viscosity — resin | 60,000 | cP | At 25 °C; test method not stated |
| Viscosity — hardener | 100 | cP | At 25 °C; test method not stated |
| Specific gravity | 1.55 / 1.21 / 1.46 | — | Resin / hardener / mixed material at 25 °C |
| Gel time | 20 | minutes | Mixed material at 121 °C |
| Working life | 1–2 | days | Mixed material at 25 °C |
| Shelf life | 6 months / 1 year | — | Resin / hardener from date of manufacture; stored at 25 °C in original, unopened containers |
After-processing / final-state properties
Typical cured properties after a cure schedule of 2 hours at 90 °C followed by 2 hours at 120 °C. Values are not intended for specification purposes.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Volume resistivity | 1.4 × 1016 | ohm-cm | ASTM D257 at 25 °C |
| Coefficient of linear thermal expansion | 32 | ppm/°C | ASTM D696 |
| Hardness | 90 | Shore D | ASTM D2240 |
| Tensile strength | 76.5 | MPa | ASTM D638 |
| Elongation at break | 3.2 | % | ASTM D638 |
| Moisture absorption | 0.26 | % | ASTM D570 |
| Dielectric strength | 500 | V/mil | ASTM D149 |
| Dielectric constant | 3.09 | — | ASTM D150 at 25 °C and 1 MHz |
