Momentive Performance Materials RTV656 Clear Extreme Low Temperature Potting/Encapsulating Compound

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Momentive Performance Materials RTV656 Clear Extreme Low Temperature Potting/Encapsulating Compound
Categories:	Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE); Silicone; Silicone, RTV, Encapsulation Grade
Material Notes:	Two-part addition cure. Two-part addition cure RTV silicones can be cured very quickly with the use of high heat. Addition cure products have no cure by-products and can be used to unlimited depths. Typical uses: Aerospace potting, bonding, and sealing where extended low temp performance is needed. Data provided by the manufacturer, GE Silicones. GE Silicones became a part of Momentive Performance Materials in 2006.
Key Words:	RTV Silicones; R.T.V. Silicones
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Physical Properties	Original Value	Comments

Density	1.02 g/cc
Viscosity	4000 cP @Temperature 25.0 °C

Mechanical Properties	Original Value	Comments
Hardness, Shore A	44
Tensile Strength, Ultimate	6.37 MPa
Elongation at Break	160 %

Electrical Properties	Original Value	Comments
Electrical Resistivity	3.20e+15 ohm-cm
Dielectric Constant	2.89 @Frequency 1000 Hz
Dielectric Strength	19.7 kV/mm @Thickness 1.91 mm
Dissipation Factor	0.00040 @Frequency 1000 Hz

Thermal Properties	Original Value	Comments
CTE, linear	270 µm/m-°C @Temperature 20.0 °C
Thermal Conductivity	0.190 W/m-K
Maximum Service Temperature, Air	204 °C	Continuous useful temperature.
Minimum Service Temperature, Air	-115 °C	Continuous useful temperature.

Optical Properties	Original Value	Comments
Refractive Index	1.406
Transmission, Visible	90 %	clear; thickness not quantified

Processing Properties	Original Value	Comments
Processing Temperature	25.0 °C	Cure time 4 hours.
Pot Life	240 min @Temperature 25.0 °C

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