ITW Insulcast® RTVS 27 Silicone Potting/Encapsulation Compound

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ITW Insulcast® RTVS 27 Silicone Potting/Encapsulation Compound
Categories:	Polymer; Thermoset; Silicone; Silicone, RTV, Encapsulation Grade
Material Notes:	Insulcast® solutions are compounds designed for potting and encapsulating. RTVS 27 is a low viscosity UL 94V-0 Flame Retardant, general purpose, reversion resistant RTV Silicone. With the ability to cure rapidly at elevated temperature, RTVS 27 combines the virtues of low temperature flexibility, excellent electrical properties, high temperature resistance and easy removal for component replacement or repair. Information provided by ITW Performance Polymers.
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Physical Properties	Original Value	Comments

Specific Gravity	1.50 g/cc	Uncured. Part A
	1.50 g/cc	Uncured. Part B
Viscosity	2800 cP	Part B; ASTM D1084
	2900 cP	Mixed, Part A, Part B; ASTM D1084
	3000 cP	Part A; ASTM D1084

Mechanical Properties	Original Value	Comments
Hardness, Shore A	60	ASTM D2240
Tensile Strength	500 psi	ASTM D412
Elongation at Break	135 %	ASTM D412
Tear Strength	18.0 pli	Die B; ASTM D624

Electrical Properties	Original Value	Comments
Volume Resistivity	1.00e+15 ohm-cm	ASTM D257
Dielectric Constant	3.0 @Frequency 1000 Hz	ASTM D150
Dielectric Strength	500 V/mil	ASTM D149
Dissipation Factor	0.0040 @Frequency 1000 Hz	ASTM D150

Thermal Properties	Original Value	Comments
CTE, linear	22.0 µm/m-°C
Thermal Conductivity	0.310 W/m-K
	2.16 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air	204 °C
Minimum Service Temperature, Air	-55.0 °C
Flammability, UL94	V-0

Processing Properties	Original Value	Comments
Cure Time	0.250 hour @Temperature 125 °C	option
	1.00 hour @Temperature 90.0 °C	option
	4.00 hour @Temperature 60.0 °C	option
	24.0 hour @Temperature 25.0 °C	option
Pot Life	60.0 - 90.0 min	Part A, Part B
Shelf Life	12.0 Month	Part A, Part B

Descriptive Properties
Color	Buff (Neutral)	part B, uncured
	Dark Gray	part A, uncured
Mix Ratio by volume	1:1	Part A: Part B
Mix Ratio by weight	1:1	Part A: Part B

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PITWIN9116 / 239626

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