Wacker Powersil® 740 LIGHT GRAY A/B Silicone Rubber

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Wacker Powersil® 740 LIGHT GRAY A/B Silicone Rubber
Categories:	Polymer; Thermoset; Silicone; Silicone Rubber
Material Notes:	POWERSIL® 740 LIGHT GRAY A/B is a paste-like, two-component compound with short curing times. Its vulcanizates are noted for high tracking and erosion resistance, their good mechanical properties especially for high tear strength as well as for their excellent dielectric behavior. Special features: outstanding dielectric properties high tracking and erosion resistance excellent hydrophobic properties very easy to process high tear strength and high elongation excellent mechanical properties Application: cable accessories insulators outdoor and indoor use Information provided by Wacker Chemie AG.
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Physical Properties	Metric	English	Comments

Density	1.14 g/cc	0.0412 lb/in³	ISO 1183-1 A
Viscosity	400000 cP @Shear Rate 10.0 1/s	400000 cP @Shear Rate 10.0 1/s	Component B; ISO 3219
	425000 cP @Shear Rate 10.0 1/s	425000 cP @Shear Rate 10.0 1/s	Mix; ISO 3219
	450000 cP @Shear Rate 10.0 1/s	450000 cP @Shear Rate 10.0 1/s	Component A; ISO 3219

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	40	40	ISO 868
Tensile Strength at Break	9.80 MPa	1420 psi	ISO 37
Elongation at Break	670 %	670 %	ISO 37
Tear Strength	38.0 kN/m	217 pli	ASTM 624 B

Electrical Properties	Metric	English	Comments
Volume Resistivity	1.00e+16 ohm-cm	1.00e+16 ohm-cm	IEC 60093
Dielectric Constant	2.9 @Frequency 50 Hz	2.9 @Frequency 50 Hz	IEC 60250
Dielectric Strength	23.0 kV/mm	584 kV/in	IEC 60243
Dissipation Factor	0.00040 @Frequency 50 Hz	0.00040 @Frequency 50 Hz	IEC 60250
Arc Resistance	300 sec	300 sec	IEC 61621

Thermal Properties	Metric	English	Comments
Oxygen Index	31 %	31 %	ASTM D2863

Processing Properties	Metric	English	Comments
Cure Time	5.00 min @Treatment Temp. 165 °C	0.0833 hour @Treatment Temp. 329 °F	post-cured 4hr at 200°C
Pot Life	4320 min	4320 min

Descriptive Properties
Color	gray
Track Resistance	1A 4.5		IEC 60587

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PWACK9384 / 204913

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