Wacker Powersil® 555 R Silicone Dispersion

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Wacker Powersil® 555 R Silicone Dispersion
Categories:	Polymer; Thermoset; Silicone; Silicone Rubber
Material Notes:	POWERSIL® 555 R Dispersion Coating is a one component liquid silicone RTV system that is designed as an insulator coating for high voltage applications. When exposed to moisture in the air, POWERSIL® 555 R cures to a flexible elastomer with excellent electrical and mechanical properties. Special features: Excellent unprimed adhesion Excellent unprimed adhesion One component, ready-to-use Easy to apply Sprayable or paintable Application: Protective coating for glass, porcelain or epoxy insulators and other high-voltage insulations, where contamination causes service problems. POWERSIL® 555 R prevents the formation of wet conductive films and therefore the risk of tracking and especially flashovers. Information provided by Wacker Chemie AG.
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Physical Properties	Metric	English	Comments

Density	1.13 g/cc	0.0408 lb/in³	uncured
	1.44 g/cc	0.0520 lb/in³	ISO 2781
Solids Content	70 %	70 %
Viscosity	3500 cP	3500 cP	ISO 3219

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	56	56	ISO 868
Tensile Strength at Break	3.31 MPa	480 psi	ISO 37
Elongation at Break	100 %	100 %	ISO 37
Tear Strength	8.77 kN/m	50.0 pli	ASTM D624B

Electrical Properties	Metric	English	Comments
Volume Resistivity	2.00e+15 ohm-cm	2.00e+15 ohm-cm	IEC 60093
Dielectric Constant	4.0 @Frequency 60 Hz	4.0 @Frequency 60 Hz	IEC 60250
Dielectric Strength	20.0 kV/mm	508 kV/in	IEC 60243
Dissipation Factor	0.060 @Frequency 60 Hz	0.060 @Frequency 60 Hz	IEC 60250
Arc Resistance	420 sec	420 sec	IEC 61621

Processing Properties	Metric	English	Comments
Cure Time	10.0 min @Treatment Temp. 25.0 °C	0.167 hour @Treatment Temp. 77.0 °F	skin forming time, 50% RH
Tack-Free Time	25.0 min @Treatment Temp. 25.0 °C	0.417 hour @Treatment Temp. 77.0 °F	50% RH

Descriptive Properties
Color	gray

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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PWACK9374 / 204903

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