DuPont Mobility and Materials Vespel® CR-4638 Thermoplastic Parts and Shapes

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DuPont Mobility and Materials Vespel® CR-4638 Thermoplastic Parts and Shapes
Categories:	Polymer; Thermoplastic
Material Notes:	Vespel® CR-4638 parts use the latest reinforced, chemically resistant, thermoplastic polymer. Custom parts molded from CR-4638 resin help provide electrical conductivity to dissipate accumulated static charges, resulting in lower particle generation. CR-4638 material also offers improved wear resistance for longer part life. Customers have reported that these characteristics are beneficial in a variety of applications, including semiconductor wafer handling. Traditional thermoplastic processing methods can be employed to produce custom parts with CR-4638. Information provided by DuPont.
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Physical Properties	Original Value	Comments

Specific Gravity	1.42 g/cc	ASTM D792
Water Absorption	0.060 %	24 hrs @ 73°F.; ASTM D570

Mechanical Properties	Original Value	Comments
Hardness, Rockwell E	40	ASTM D785
Tensile Strength	142 MPa	ISO 527
Elongation at Break	1.0 %	ISO 527
Tensile Modulus	21.1 GPa	ISO 527
Flexural Strength	216 MPa	ISO 178
Flexural Modulus	19.7 GPa	ISO 178
Izod Impact, Notched (ISO)	5.03 kJ/m²	ISO 180
Izod Impact, Unnotched (ISO)	20.0 kJ/m²	ISO 180

Electrical Properties	Original Value	Comments
Volume Resistivity	10000 ohm-cm - 1e+05	ASTM D4496
Surface Resistance	10000 ohm - 1e+05	IEC 60093

Thermal Properties	Original Value	Comments
CTE, linear, Parallel to Flow	6.60 µm/m-°C @Temperature 23.0 - 150 °C	ISO 11359-1/-2
CTE, linear, Transverse to Flow	48.5 µm/m-°C @Temperature 23.0 - 150 °C	ISO 11359-1/-2
Deflection Temperature at 0.46 MPa (66 psi)	157 °C	ISO 75F
Deflection Temperature at 1.8 MPa (264 psi)	151 °C	ISO 75F
Glass Transition Temp, Tg	154 °C	DMA
Flammability, UL94	V-0 @Thickness 3.20 mm

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