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Vespel Specs

        Vespel SP-1
    Units ASTM Test Method Dupont Polyimide
MECHANICAL Strength to Weight Ratio ksi -  
Specific Gravity @73 F - D792 1.43
Tensile Strength @73 F, (ult)/(yld) psi D638 12500 (ult)
Tensile Modulus of Elasticity @ 73 F psi D638 -
Tensile Elongation at Break @ 73 F % D638 8
Flexural Strength @ 73 F psi D790 16000
Flexural Modulus of Elasticity @ 73 F psi D790 450000
Shear Strength @ 73 F psi D732 13000
Compressive Strength, (% Deformation) @73 F psi D695 19300 (10)
Compressive Modulus of Elasticity @73 F psi D695 350000
Hardness, Rockwell, Scale as noted @73 F - D785 (E45)
Hardness, Durometer, Shore D @73 F - D2240 -
Izod Impact, (Notched) @73 F ft-lb/in of notch D256 TypeA 0.8
Coefficient of Friction, (Dry vs. Steel) Dynamic - - 0.29
Limiting PV, (with 4 to 1 factor of safety applied) psi-ft/min - -
THERMAL Coefficient of Linear Thermal Expansion @73 F in/in/F E-831 (TMA) 3.0E-05
Heat Deflection Temperature @ 264 psi F D648 680
Tg-Glass transition temperature, (Amorphous) F D3418 -
Melting Point, (VS=Vicat Softening Temp.) F D3418 -
Continuous Service Temperature in Air, (Max.) F - -
Thermal Conductivity BTU-in/hr-ft2-F - 2.40
ELECTRICAL Dielectric Strength, Short Term Volts/mil D149 560
Volume Resistivity ohm-cm D257 1E15-1E16
Dielectric Constant @ 10E6 Hz - D150 3.6
Dissipation Factor @ 10E6 Hz - D150 0.003
Flammability @ 3.1 mm unless noted - UL94 -
H20 Water Absorbtion, Immersion, 24 Hrs % by wt. D570(7) 0.24
Water Absorbtion, Saturation % by wt. D570(7) 1.30

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