Sumitomo Bakelite North America RX® 431 Cellulose Reinforced Phenolic Novolac

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Sumitomo Bakelite North America RX® 431 Cellulose Reinforced Phenolic Novolac
Categories:	Polymer; Thermoset; Filled/Reinforced Thermoset; Phenolic; Phenolic, Novolac, Cellulose Filled
Material Notes:	RX431 is a cellulose fiber reinforced phenolic novolac molding compound. This material is recommended for large parts requiring moderate toughness. It is designed to meet the requirements of ASTM D-5948-96, Type CFI-10. (Replaces Military Specification MIL-M-14H.) Information supplied by Sumitomo Bakelite North America.
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Physical Properties	Metric	English	Comments

Bulk Density	0.400 g/cc	0.0145 lb/in³	Powder; ASTM D1895
Density	1.43 g/cc	0.0517 lb/in³	ASTM D-792
Water Absorption	0.60 %	0.60 %	24 hour; ASTM D570
	1.9 %	1.9 %	48 hour; ASTM D570
Linear Mold Shrinkage	0.0020 cm/cm	0.0020 in/in	ASTM D955

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell E	75	75	ASTM D785
Tensile Strength, Ultimate	41.0 MPa	5950 psi	ASTM D638
Flexural Strength	75.0 MPa	10900 psi	ASTM D790
Flexural Modulus	11.0 GPa	1600 ksi	ASTM D790
Compressive Strength	186 MPa	27000 psi	ASTM D695
Izod Impact, Notched	0.580 J/cm	1.09 ft-lb/in	ASTM D256A

Electrical Properties	Metric	English	Comments
Dielectric Strength	1.40 kV/mm	35.6 kV/in	60 Hz, wet, SS; ASTM D149
	1.60 kV/mm	40.6 kV/in	ST; ASTM D149
Arc Resistance	60 sec	60 sec	ASTM D495

Thermal Properties	Metric	English	Comments
CTE, linear, Parallel to Flow	27.0 µm/m-°C @Temperature 20.0 °C	15.0 µin/in-°F @Temperature 68.0 °F	ASTM E831
CTE, linear, Transverse to Flow	69.0 µm/m-°C @Temperature 20.0 °C	38.3 µin/in-°F @Temperature 68.0 °F	ASTM E831
Thermal Conductivity	0.580 W/m-K	4.03 BTU-in/hr-ft²-°F	ASTM C518
Maximum Service Temperature, Air	150 °C	302 °F	UL Temperature Index; UL 746B
Deflection Temperature at 1.8 MPa (264 psi)	180 °C	356 °F	As Molded; ASTM D648A
Flammability, UL94	HB @Thickness 1.60 mm	HB @Thickness 0.0630 in
	HB @Thickness 3.20 mm	HB @Thickness 0.126 in

Descriptive Properties
Available Molding Grades	Compression, Transfer, Injection
Color	Black
Form	Pellet

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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