Sumitomo Bakelite Durez® 22257 Phenolic, Injection Grade

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Sumitomo Bakelite Durez® 22257 Phenolic, Injection Grade
Categories:	Polymer; Thermoset; Phenolic; Phenolic, Novolac, Impact Grade, Filled
Material Notes:	Durez 22257 Black Phenolic is a two-stage, asbestos-free, medium impact molding material. It is designed for appliance and electrical applications where additional mechanical strength is required. Typical applications include circuit breakers, small motor bases and housings, appliance panels, terminal blocks, barrier strips, etc. Durez 22257 is fungus resistant per Mil-I-631D and Mil-810 A/E-2572 Information provided by Sumitomo Bakelite North America, Inc.
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Physical Properties	Original Value	Comments

Density	1.39 g/cc	ASTM D792
Apparent Bulk Density	0.570 g/cc	ASTM D1895
Water Absorption	0.60 %	ASTM D570
Linear Mold Shrinkage	0.011 cm/cm	ASTM D955

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	55.0 MPa	ASTM D638
Tensile Modulus	7.60 GPa	ASTM D638
Flexural Strength	69.0 MPa
Compressive Strength	193 MPa	ASTM D695
Shear Strength	76.0 MPa	as molded
Izod Impact, Notched	0.240 J/cm	ASTM D256

Electrical Properties	Original Value	Comments
Electrical Resistivity	1.00e+12 ohm-cm	ASTM D257
Dielectric Constant	5.5 @Frequency 1e+6 Hz	ASTM D150
Dielectric Strength	7.90 kV/mm	Step by step; ASTM D149
	8.90 kV/mm	Short Time; ASTM D149
Dissipation Factor	0.080 @Frequency 1e+6 Hz	ASTM D150

Thermal Properties	Original Value	Comments
CTE, linear	42.2 µm/m-°C @Temperature 23.0 - 60.0 °C
Specific Heat Capacity	1.42 J/g-°C
Thermal Conductivity	0.402 W/m-K
Maximum Service Temperature, Air	150 °C	UL temperature Index
Deflection Temperature at 1.8 MPa (264 psi)	149 °C	ASTM D648
Flammability, UL94	HB @Thickness 3.00 mm
	V-0 @Thickness 6.00 mm

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