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Chemically Resistant adhesives

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ITW Insulcast® RTVS 42 CURTIS II Silicone Potting/Encapsulation Compound
Categories: Polymer; Thermoset; Silicone; Silicone, RTV, Encapsulation Grade

Material Notes: Insulcast® solutions are compounds designed for potting and encapsulating. RTVS 42 CURTIS II is a low viscosity unique silicone-epoxy copolymer formulated to withstand severe thermal shock and provide low moisture absorption and excellent dielectric insulation. It is UL 94V-0 certified under file # E86165. RTVS 42 CURTIS II contains silane adhesion promoters that enable it to bond well to most metals and plastics. Its unique chemistry combines the low temperature performance characteristics heretofore found only in silicones with the excellent encapsulating properties of epoxies.

Information provided by ITW Performance Polymers.

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Physical PropertiesOriginal ValueComments
Specific Gravity 1.02 g/ccUncured. Part B
 1.43 g/ccUncured. Part A
Viscosity 125 cPPart B; ASTM D1084
 16000 cPMixed, Part A, Part B; ASTM D1084
 18000 cPPart A; ASTM D1084
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 75ASTM D2240
Hardness, Shore D 10 - 15
Tensile Strength 900 psiASTM D412
Elongation at Break 175 %ASTM D412
Tear Strength 40.0 pliDie B; ASTM D624
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity 1.00e+15 ohm-cmASTM D257
Dielectric Constant 4.0
@Frequency 1000 Hz
ASTM D150
Dielectric Strength 500 V/milASTM D149
Dissipation Factor 0.0060
@Frequency 1000 Hz
ASTM D150
 
Thermal PropertiesOriginal ValueComments
CTE, linear 45.0 µm/m-°C
Thermal Conductivity 0.580 W/m-K
Maximum Service Temperature, Air 125 °C
 155 °Cintermittent use
Minimum Service Temperature, Air -55.0 °C
Glass Transition Temp, Tg -60.0 °Ccured
Flammability, UL94 V-0
Shrinkage 0.20 - 0.50 %
 
Processing PropertiesOriginal ValueComments
Cure Time 2.00 hour
@Temperature 65.0 °C
8 hrs @ 25°C plus 2 hours @ 65°C
 24.0 hour
@Temperature 25.0 °C
option
Pot Life <= 20.0 minPart A, Part B
Shelf Life 9.00 MonthPart A, Part B
 
Descriptive Properties
Coloramberpart B, uncured
 blackpart A, uncured
Mix Ratio by volume100:7Part A: Part B
Mix Ratio by weight100:4-8Part A: Part B

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PITWIN9121 / 239631

Chemically Resistant adhesives

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