COOLTHERM DC-812

Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others

COOLTHERM DC-812

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
Product Family

COOLTHERM DC-812

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Resin: Gray Liquid | Hardener: Amber Liquid | Mixed: Tan Liquid
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
Resin: 1.55 | Hardener: 1.21 | Mixed: 1.46
Physical Properties
Viscosity (Part A)
(Resin) 60000 mPa.s
Viscosity (Part B)
(Hardener) 100 mPa.s

Additional Information

Technical properties

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
Technical properties

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

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