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Chemically Resistant adhesives

Lord Adhesives Thermoset™ SC-309 Thermally Conductive Silicone Encapsulating System
Categories: Polymer; Thermoset; Silicone; Silicone, RTV, Encapsulation Grade
Material Notes: Lord SC-309 is a two part thermally conductive silicone system with a convenient 1:1 by weight or volume mix ratio.

Lord SC-309 cures to a flexible elastomer, which offers the low stress characteristics and superior high temperature electrical properties associated with silicone resins. It retains its excellent flexibility over a wide range of temperatures. SC-309 is recognized by Underwriters Laboratories as a 94V-0 material.

Lord SC-309 is addition curing. It will not depolymerize when heated in confined spaces as do many condensation curing silicones. As with all silicones, SC-309 generates no exotherm as it cures. It also exhibits low shrinkage and stress on components as it cures. Lord SC-309's cure may be accelerated with elevated temperature.

All information provided by Lord.
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Physical PropertiesMetricEnglishComments
Specific Gravity 1.66 g/cc
@Temperature 25.0 °C		1.66 g/cc
@Temperature 77.0 °F		STM 2
Water Absorption <= 0.50 %<= 0.50 %
Viscosity 3500 cP
@Temperature 25.0 °C		3500 cP
@Temperature 77.0 °F
 
Mechanical PropertiesMetricEnglishComments
Shear Strength 0.345 MPa50.0 psi
Tear Strength Test 3030psi
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity 4.30e+13 ohm-cm
@Temperature 25.0 °C		4.30e+13 ohm-cm
@Temperature 77.0 °F		ASTM D257
Dielectric Constant 4.0
@Frequency 100000 Hz,
Temperature 25.0 °C		4.0
@Frequency 100000 Hz,
Temperature 77.0 °F		ASTM D150
Dielectric Strength 23.6 kV/mm600 kV/in
Dissipation Factor 0.0040
@Frequency 100000 Hz,
Temperature 25.0 °C		0.0040
@Frequency 100000 Hz,
Temperature 77.0 °F		ASTM D150
 
Thermal PropertiesMetricEnglishComments
CTE, linear 190 µm/m-°C106 µin/in-°F
Thermal Conductivity 1.013 W/m-K7.030 BTU-in/hr-ft²-°FMathis Hot Disc
Maximum Service Temperature, Air 200 °C392 °F
Glass Transition Temp, Tg >= -100 °C>= -148 °F
Flammability, UL94 V-0
@Thickness >=3.17 mm		V-0
@Thickness >=0.125 in
 
Processing PropertiesMetricEnglishComments
Cure Time  10.0 min
@Temperature 120 °C		0.167 hour
@Temperature 248 °F
 15.0 min
@Temperature 100 °C		0.250 hour
@Temperature 212 °F
Pot Life 30 min
@Temperature 25.0 °C		30 min
@Temperature 77.0 °F
Shelf Life 6.00 Month
@Temperature 25.0 °C		6.00 Month
@Temperature 77.0 °F
 
Descriptive Properties
Mix Ratio1:1by weight, by volume

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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Chemically Resistant adhesives




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