CoolTherm® SC-420 Thermally Conductive Silicone Encapsulant Contact Us to Buy
LORD CoolTherm® SC-420 thermally conductive silicone encapsulant is a two-component system designed to provide excellent thermal conductivity and flexibility for electrical/electronic encapsulating applications, while retaining desirable properties associated with silicones.
Shelf life of each component is nine months from date of manufacture when stored at 25°C in original, unopened container.
CoolTherm SC-420 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.
Uncured Typical Properties*
|Mixed Appearance||Gray Paste|
|Mixed Viscosity, cps @ 25°C||50,000|
|Mixed Specific Gravity||3.18|
|Gel Time, min @ 25°C||70|
|Working Life, min @ 25°C||>30|
|Cure Time, min @ 125°C||60|
Cured Typical Properties*
|Volume Resistivity, ohm-cm @ 25°C||1 x 1014|
|Thermal Conductivity, W/mK||3.2|
|Coefficient of Linear Thermal Expansion, ppm/°C||100|
|Hardness, Shore A||20|
|Tensile Strength, psi||145|
|Elongation at Break, %||100|
|Moisture Absorption, %||< 0.5|
|Dielectric Constant, @ 25°C||< 5|
|Dissipation Factor, % @ 25°C||< 1|
* Data is typical and not to be used for specification purposes.
Cure schedule of 60 minutes at 125°C.