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	Metric	English	Comments

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

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	60	60	ASTM D2240
Tensile Strength	3.45 MPa	500 psi	ASTM D412
Elongation at Break	135 %	135 %	ASTM D412
Tear Strength	3.16 kN/m	18.0 pli	Die B; ASTM D624

Electrical Properties	Metric	English	Comments
Volume Resistivity	1.00e+15 ohm-cm	1.00e+15 ohm-cm	ASTM D257
Dielectric Constant	3.0 @Frequency 1000 Hz	3.0 @Frequency 1000 Hz	ASTM D150
Dielectric Strength	19.7 kV/mm	500 kV/in	ASTM D149
Dissipation Factor	0.0040 @Frequency 1000 Hz	0.0040 @Frequency 1000 Hz	ASTM D150

Thermal Properties	Metric	English	Comments
CTE, linear	22.0 µm/m-°C	12.2 µin/in-°F
Thermal Conductivity	0.310 W/m-K	2.15 BTU-in/hr-ft²-°F
	0.311 W/m-K	2.16 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air	204 °C	399 °F
Minimum Service Temperature, Air	-55.0 °C	-67.0 °F
Flammability, UL94	V-0	V-0

Processing Properties	Metric	English	Comments
Cure Time	15.0 min @Temperature 125 °C	0.250 hour @Temperature 257 °F	option
	60.0 min @Temperature 90.0 °C	1.00 hour @Temperature 194 °F	option
	240 min @Temperature 60.0 °C	4.00 hour @Temperature 140 °F	option
	1440 min @Temperature 25.0 °C	24.0 hour @Temperature 77.0 °F	option
Pot Life	60.0 - 90.0 min	60.0 - 90.0 min	Part A, Part B
Shelf Life	12.0 Month	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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