CoolTherm® SC-303 Thermally Conductive Silicone Encapsulant Where to Buy
Product Information
LORD CoolTherm® SC-303 thermally conductive silicone encapsulant is a two-component system designed to provide excellent thermal conductivity for electrical/ electronic encapsulating applications, while retaining desirable properties associated with silicones.
Shelf Life
Shelf life of each component is nine months from date of manufacture when stored at 25°C in original, unopened container.
CoolTherm SC-303 hardener evolves minute quantities of hydrogen gas. Do not repackage or store material in unvented containers. Adequately ventilate work area to prevent the accumulation of gas.
Features and Benefits
Low Stress – exhibits low shrinkage and stress on components as it cures.
Durable – composed of an addition-curing polydimethyl siloxane polymer that will not depolymerize when heated in confined spaces.
Low Viscosity – maintains low viscosity for ease of component encapsulation compared to other highly thermally conductive materials.
Environmentally Resistant – provides excellent thermal shock resistance.
UL Rated – provides excellent flame retardancy; UL 94 V-O certified.
Broad Temperature Range – can be used on parts and devices that experience operating temperatures from -40°C to 200°C.
Uncured Typical Properties*
| Mixed Appearance | Light Gray Paste |
| Mixed Viscosity, cps @ 25°C | 6000 |
| Mixed Specific Gravity | 2.15 |
| Gel Time, min | 60-120 |
| Working Life, min @ 25°C | 50 |
| Cure Time |
24 hr @ 25°C; or 25-30 min @ 70°C; or 10-15 min @ 100°C |
Cured Typical Properties*
| Volume Resistivity, ohm-cm @ 25°C | 3.8 x 1015 |
| Thermal Conductivity, W/mK | 0.9 |
| Coefficient of Linear Thermal Expansion, ppm/°C | 200 |
| Hardness, Shore A | 45 |
| Tensile Strength, psi | 170 |
| Elongation at Break, % | 90 |
| Moisture Absorption, % | 0.05 |
| Dielectric Strength, V/mil | 440 |
| Dielectric Constant, @ 25°C | 4.20 |
| Dissipation Factor, @ 25°C | 0.02 |
*Data is typical and not to be used for specification purposes.
Cure schedule of 16 hours at 25°C, plus 2 hours at 100°C.
Literature
| Download | Type | Name | |
|---|---|---|---|
| Safety Data Sheet | COOLTHERM SC-303 RESIN | |
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| Safety Data Sheet | COOLTHERM SC-303 HARDENER | |
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Product Catalog | Potting & Encapsulation Materials | |
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Technical Data Sheet | CoolTherm SC-303 Thermally Conductive Silicone Encapsulant | |
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Filled Addition-Curing Silicone Encapsulant Handling/Application Notes |
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