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Chemically Resistant adhesives

Lord Adhesives CoolTherm™ SC-420 Thermally Conductive Silicone Encapsulant System
Categories: Polymer; Thermoset; Silicone; Silicone Elastomer, for Thermal Management
Material Notes: 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. 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: exhibits low shrinkage and stress on components as it cures. composed of an addition-curing polydimethyl siloxane polymer that will not depolymerize when heated in confined spaces. maintains low viscosity for ease of component encapsulation compared to other highly thermally conductive materials. provides excellent thermal shock resistance.

All information provided by Lord.
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Physical PropertiesMetricEnglishComments
Specific Gravity 3.18 g/cc3.18 g/ccSC-420 Resin
 3.18 g/cc3.18 g/ccSC-420 Hardener
 3.18 g/cc3.18 g/ccMixed
Water Absorption <= 0.50 %<= 0.50 %cured; ASTM D 570-81
Viscosity  27000 cP
@Temperature 25.0 °C		27000 cP
@Temperature 77.0 °F		SC-420 Hardener
 50000 cP
@Temperature 25.0 °C		50000 cP
@Temperature 77.0 °F		Mixed
 63000 cP
@Temperature 25.0 °C		63000 cP
@Temperature 77.0 °F		SC-420 Resin
 
Mechanical PropertiesMetricEnglishComments
Hardness, Shore A 2020cured; ASTM D 2240
Tensile Strength 1.00 MPa145 psicured; ASTM D412
Elongation at Break 100 %100 %cured; ASTM D 412
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity 1.00e+14 ohm-cm
@Temperature 25.0 °C		1.00e+14 ohm-cm
@Temperature 77.0 °F		cured; ASTM D 257
 
Thermal PropertiesMetricEnglishComments
CTE, linear 100 µm/m-°C55.6 µin/in-°Fcured; ASTM C 864
Thermal Conductivity 3.20 W/m-K22.2 BTU-in/hr-ft²-°Fcured, hot disc transient method
 
Processing PropertiesMetricEnglishComments
Pot Life >= 30.0 min
@Temperature 25.0 °C		>= 30.0 min
@Temperature 77.0 °F		mixed
Gel Time 70.0 min
@Temperature 25.0 °C		70.0 min
@Temperature 77.0 °F		mixed
Shelf Life 9.00 Month
@Temperature 25.0 °C		9.00 Month
@Temperature 77.0 °F		each component, from date of manufacture when stored in original, unopened container
 
Descriptive Properties
AppearanceBlack PasteSC-420 Resin
 Grey PasteMixed
 White PasteSC-420 Hardener

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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PLORD9253 / 232609

Chemically Resistant adhesives




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