DuPont Mobility and Materials Vespel® SP-21 Polyimide, 15% Graphite Filled, Direct formed

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DuPont Mobility and Materials Vespel® SP-21 Polyimide, 15% Graphite Filled, Direct formed
Categories:	Polymer; Thermoplastic; Polyimide, Thermoplastic
Material Notes:	Graphite added to provide low wear and friction for bearings, thrust washers, and dynamic seals. Applications: For lubricated or non-lubricated, low friction and wear applications. Valve seats, seals, bearings, washers, seal rings. Direct-formed properties were measured perpendicular to the forming direction unless specified. Machined properties are non-directional Information provided by DuPont Information provided by DuPont. This product line has remained with DuPont after the DuPont-Dow merger.
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Physical Properties	Metric	English	Comments

Specific Gravity	1.42 g/cc	1.42 g/cc	ASTM D792
Moisture Absorption at Equilibrium	0.80 - 1.1 %	0.80 - 1.1 %	50% RH
Deformation	0.17 %	0.17 %	2000 psi; 122°F; ASTM D621

Mechanical Properties	Metric	English	Comments
Tensile Strength, Ultimate	62.1 MPa	9000 psi	73°F; ASTM D1708
	30.3 MPa @Temperature 260 °C	4400 psi @Temperature 500 °F	ASTM D1708
Elongation at Break	5.5 %	5.5 %	73°F; ASTM D1708
	5.2 % @Temperature 260 °C	5.2 % @Temperature 500 °F	ASTM D1708
Flexural Strength	48.3 MPa	7000 psi	500°F; ASTM D790
	82.7 MPa	12000 psi	73°F; ASTM D790
Flexural Modulus	1.79 GPa	260 ksi	500°F; ASTM D790
	3.17 GPa	460 ksi	73°F; ASTM D790
Compressive Strength	22.8 MPa	3300 psi	@1% strain; 73°F; ASTM D695
	33.8 MPa	4900 psi	@0.1% Offset; 73°F; ASTM D695
	105 MPa	15200 psi	@10% strain; 73°F; ASTM D695
Compressive Modulus	2.28 GPa	330 ksi	73°F; ASTM D695
Coefficient of Friction, Dynamic	0.12	0.12	PV-100,000. Steady State; Unlubricated in air.
	0.24	0.24	PV-25,000. Steady State; Unlubricated in air.

Thermal Properties	Metric	English	Comments
CTE, linear	41.4 µm/m-°C @Temperature 22.8 - 300 °C	23.0 µin/in-°F @Temperature 73.0 - 572 °F	ASTM E-228
Thermal Conductivity	0.461 W/m-K	3.20 BTU-in/hr-ft²-°F	104°F

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PDU2003 / 32864

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