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	Original Value	Comments

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

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	9000 psi	73°F; ASTM D1708
	4400 psi @Temperature 260 °C	ASTM D1708
Elongation at Break	5.5 %	73°F; ASTM D1708
	5.2 % @Temperature 260 °C	ASTM D1708
Flexural Strength	7000 psi	500°F; ASTM D790
	12000 psi	73°F; ASTM D790
Flexural Modulus	260 ksi	500°F; ASTM D790
	460 ksi	73°F; ASTM D790
Compressive Strength	3300 psi	@1% strain; 73°F; ASTM D695
	4900 psi	@0.1% Offset; 73°F; ASTM D695
	15200 psi	@10% strain; 73°F; ASTM D695
Compressive Modulus	330000 psi	73°F; ASTM D695
Coefficient of Friction, Dynamic	0.12	PV-100,000. Steady State; Unlubricated in air.
	0.24	PV-25,000. Steady State; Unlubricated in air.

Thermal Properties	Original Value	Comments
CTE, linear	23.0 µin/in-°F @Temperature 22.8 - 300 °C	ASTM E-228
Thermal Conductivity	3.20 BTU-in/hr-ft²-°F	104°F

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PDU2003 / 32864

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