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	Metric	English	Comments

Specific Gravity	1.43 g/cc	1.43 g/cc	ASTM D792
Water Absorption	0.24 %	0.24 %	24 hrs @ 73°F.; ASTM D570
	0.72 %	0.72 %	48 hrs @ 122°F; ASTM D570
Moisture Absorption at Equilibrium	1.0 - 1.3 %	1.0 - 1.3 %	50% RH
Deformation	0.14 %	0.14 %	2000 psi; 122°F; ASTM D621

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell E	45 - 60	45 - 60	ASTM D785
Tensile Strength, Ultimate	86.2 MPa	12500 psi	73°F; ASTM D1708
	41.4 MPa @Temperature 260 °C	6000 psi @Temperature 500 °F	ASTM D1708
Elongation at Break	7.5 %	7.5 %	73°F; ASTM D1708
	6.0 % @Temperature 260 °C	6.0 % @Temperature 500 °F	ASTM D1708
Flexural Strength	62.1 MPa	9000 psi	500°F; ASTM D790
	110 MPa	16000 psi	73°F; ASTM D790
Flexural Modulus	1.72 GPa	250 ksi	500°F; ASTM D790
	3.10 GPa	450 ksi	73°F; ASTM D790
Compressive Strength	24.8 MPa	3600 psi	@1% strain; 73°F; ASTM D695
	51.0 MPa	7400 psi	@0.1% Offset; 73°F; ASTM D695
	133 MPa	19300 psi	@10% strain; 73°F; ASTM D695
Compressive Modulus	2.41 GPa	350 ksi	73°F; ASTM D695
Poissons Ratio	0.41	0.41	73°F
Fatigue Strength	16.5 MPa @# of Cycles 1.00e+7 , Temperature 260 °C	2400 psi @# of Cycles 1.00e+7 , Temperature 500 °F	Axial Fatigue Endurance Limit
	26.2 MPa @# of Cycles 1000 , Temperature 260 °C	3800 psi @# of Cycles 1000 , Temperature 500 °F	Axial Fatigue Endurance Limit
	42.1 MPa @# of Cycles 1.00e+7 , Temperature 22.8 °C	6100 psi @# of Cycles 1.00e+7 , Temperature 73.0 °F	Axial Fatigue Endurance Limit
	44.8 MPa @# of Cycles 1.00e+8 , Temperature 22.8 °C	6500 psi @# of Cycles 1.00e+8 , Temperature 73.0 °F	Flexural Fatigue Endurance Limit
	55.8 MPa @# of Cycles 1000 , Temperature 22.8 °C	8100 psi @# of Cycles 1000 , Temperature 73.0 °F	Axial Fatigue Endurance Limit
	65.5 MPa @# of Cycles 10000 , Temperature 22.8 °C	9500 psi @# of Cycles 10000 , Temperature 73.0 °F	Flexural Fatigue Endurance Limit
Shear Strength	89.6 MPa	13000 psi	ASTM D732
Izod Impact, Notched	0.427 J/cm	0.800 ft-lb/in	73°F; ASTM D256
Izod Impact, Unnotched	7.47 J/cm	14.0 ft-lb/in	73°F; ASTM D256
Coefficient of Friction, Dynamic	0.29	0.29	PV-25,000. Steady State; Unlubricated in air.
Coefficient of Friction, Static	0.35	0.35	In air.

Electrical Properties	Metric	English	Comments
Volume Resistivity	1.00e+16 - 1.00e+17 ohm-cm	1.00e+16 - 1.00e+17 ohm-cm	73°F; ASTM D257
Surface Resistance	1.00e+15 - 1.00e+16 ohm	1.00e+15 - 1.00e+16 ohm	73°F; ASTM D257
Dielectric Constant	3.55 @Frequency 1e+6 Hz	3.55 @Frequency 1e+6 Hz	ASTM D150
	3.62 @Frequency 100 Hz	3.62 @Frequency 100 Hz	ASTM D150
	3.64 @Frequency 10000 Hz	3.64 @Frequency 10000 Hz	ASTM D150
Dielectric Strength	22.0 kV/mm	560 kV/in	Short time; 80 mils thick; 73°F; ASTM D149
Dissipation Factor	0.0018 @Frequency 100 Hz	0.0018 @Frequency 100 Hz	ASTM D150
	0.0034 @Frequency 1e+6 Hz	0.0034 @Frequency 1e+6 Hz	ASTM D150
	0.0036 @Frequency 10000 Hz	0.0036 @Frequency 10000 Hz	ASTM D150

Thermal Properties	Metric	English	Comments
CTE, linear	45.0 µm/m-°C @Temperature -62.2 - 22.8 °C	25.0 µin/in-°F @Temperature -80.0 - 73.0 °F	ASTM E-228
	54.0 µm/m-°C @Temperature 22.8 - 300 °C	30.0 µin/in-°F @Temperature 73.0 - 572 °F	ASTM E-228
Specific Heat Capacity	1.13 J/g-°C	0.270 BTU/lb-°F
Thermal Conductivity	0.346 W/m-K	2.40 BTU-in/hr-ft²-°F	104°F
Deflection Temperature at 1.8 MPa (264 psi)	360 °C	680 °F	Approximate; ASTM D648
Oxygen Index	53 %	53 %	ASTM D2863

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PDU2000 / 32861

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