Sumitomo Bakelite Durez® 25378 Phenolic, Compression Grade

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Sumitomo Bakelite Durez® 25378 Phenolic, Compression Grade
Categories:	Polymer; Thermoset; Phenolic; Phenolic, Novolac, Heat Resistant Grade, Filled
Material Notes:	Durez 25378 Black Phenolic is a two stage heat resistant/electrical grade molding material having an excellent molded finish, low shrinkage and good heat resistance. Durez 25378 has exceptional UL flammability ratings and good comparative tracking index. Information provided by Sumitomo Bakelite North America, Inc.
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Physical Properties	Metric	English	Comments

Density	1.61 g/cc	0.0582 lb/in³	ASTM D792
Apparent Bulk Density	0.680 g/cc	0.0246 lb/in³	ASTM D1895
Water Absorption	0.20 %	0.20 %	ASTM D570
Linear Mold Shrinkage	0.0040 cm/cm	0.0040 in/in	ASTM D955

Mechanical Properties	Metric	English	Comments
Tensile Strength, Ultimate	45.0 MPa	6530 psi	ASTM D638
Tensile Modulus	10.3 GPa	1490 ksi	ASTM D638
Flexural Strength	69.0 MPa	10000 psi
Compressive Strength	158 MPa	22900 psi	ASTM D695

Electrical Properties	Metric	English	Comments
Electrical Resistivity	1.00e+12 ohm-cm	1.00e+12 ohm-cm	ASTM D257
Dielectric Constant	4.9 @Frequency 1e+6 Hz	4.9 @Frequency 1e+6 Hz	ASTM D150
Dielectric Strength	12.8 kV/mm	325 kV/in	Step by step; ASTM D149
	16.7 kV/mm	424 kV/in	Short Time; ASTM D149
Dissipation Factor	0.040 @Frequency 1e+6 Hz	0.040 @Frequency 1e+6 Hz	ASTM D150
Arc Resistance	180 sec	180 sec	ASTM D495
Comparative Tracking Index	220 V	220 V	IEC Tracking Index

Thermal Properties	Metric	English	Comments
Maximum Service Temperature, Air	160 °C @Thickness 3.0 mm	320 °F @Thickness 0.12 in	UL Temperature Index
Deflection Temperature at 1.8 MPa (264 psi)	204 °C	399 °F	ASTM D648
Flammability, UL94	V-0 @Thickness 0.510 mm	V-0 @Thickness 0.0201 in
	V-0 @Thickness 1.50 mm	V-0 @Thickness 0.0591 in
	5VA @Thickness 3.30 mm	5VA @Thickness 0.130 in

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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P90X30a / 142668

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