DuPont Mobility and Materials Vespel® SP-1 Polyimide, Machined

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DuPont Mobility and Materials Vespel® SP-1 Polyimide, Machined
Categories:	Polymer; Thermoplastic; Polyimide, Thermoplastic; Thermoplastic Polyimide, Unfilled
Material Notes:	Provides maximum physical properties and best electrical and thermal insulation. Applications: Mechanical and electrical parts at elevated temperatures. Valve seats, seal, insulators. 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	1.43 g/cc	ASTM D792
Water Absorption	0.24 %	24 hrs @ 73°F.; ASTM D570
	0.72 %	48 hrs @ 122°F; ASTM D570
Moisture Absorption at Equilibrium	1.0 - 1.3 %	50% RH
Deformation	0.14 %	2000 psi; 122°F; ASTM D621

Mechanical Properties	Original Value	Comments
Hardness, Rockwell E	45 - 60	ASTM D785
Tensile Strength, Ultimate	12500 psi	73°F; ASTM D1708
	6000 psi @Temperature 260 °C	ASTM D1708
Elongation at Break	7.5 %	73°F; ASTM D1708
	6.0 % @Temperature 260 °C	ASTM D1708
Flexural Strength	9000 psi	500°F; ASTM D790
	16000 psi	73°F; ASTM D790
Flexural Modulus	250 ksi	500°F; ASTM D790
	450 ksi	73°F; ASTM D790
Compressive Strength	3600 psi	@1% strain; 73°F; ASTM D695
	7400 psi	@0.1% Offset; 73°F; ASTM D695
	19300 psi	@10% strain; 73°F; ASTM D695
Compressive Modulus	350000 psi	73°F; ASTM D695
Poissons Ratio	0.41	73°F
Fatigue Strength	2400 psi @# of Cycles 1.00e+7 , Temperature 260 °C	Axial Fatigue Endurance Limit
	3800 psi @# of Cycles 1000 , Temperature 260 °C	Axial Fatigue Endurance Limit
	6100 psi @# of Cycles 1.00e+7 , Temperature 22.8 °C	Axial Fatigue Endurance Limit
	6500 psi @# of Cycles 1.00e+8 , Temperature 22.8 °C	Flexural Fatigue Endurance Limit
	8100 psi @# of Cycles 1000 , Temperature 22.8 °C	Axial Fatigue Endurance Limit
	9500 psi @# of Cycles 10000 , Temperature 22.8 °C	Flexural Fatigue Endurance Limit
Shear Strength	13.0 ksi	ASTM D732
Izod Impact, Notched	0.800 ft-lb/in	73°F; ASTM D256
Izod Impact, Unnotched	14.0 ft-lb/in	73°F; ASTM D256
Coefficient of Friction, Dynamic	0.29	PV-25,000. Steady State; Unlubricated in air.
Coefficient of Friction, Static	0.35	In air.

Electrical Properties	Original Value	Comments
Volume Resistivity	1.00e+16 - 1.00e+17 ohm-cm	73°F; ASTM D257
Surface Resistance	1.00e+15 - 1.00e+16 ohm	73°F; ASTM D257
Dielectric Constant	3.55 @Frequency 1e+6 Hz	ASTM D150
	3.62 @Frequency 100 Hz	ASTM D150
	3.64 @Frequency 10000 Hz	ASTM D150
Dielectric Strength	560 V/mil	Short time; 80 mils thick; 73°F; ASTM D149
Dissipation Factor	0.0018 @Frequency 100 Hz	ASTM D150
	0.0034 @Frequency 1e+6 Hz	ASTM D150
	0.0036 @Frequency 10000 Hz	ASTM D150

Thermal Properties	Original Value	Comments
CTE, linear	25.0 µin/in-°F @Temperature -62.2 - 22.8 °C	ASTM E-228
	30.0 µin/in-°F @Temperature 22.8 - 300 °C	ASTM E-228
Specific Heat Capacity	0.270 BTU/lb-°F
Thermal Conductivity	2.40 BTU-in/hr-ft²-°F	104°F
Deflection Temperature at 1.8 MPa (264 psi)	680 °F	Approximate; ASTM D648
Oxygen Index	53 %	ASTM D2863

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