Vespel is the trademark of a range of durable high-performance polyimide-based plastics. This high performance polymer is mostly used in aerospace, semiconductor and transportation technology.

MechanicalASTM Test MethodValueUnits
Strength to Weight Ratio--ksi
Specific Gravity @73 FD7921.43-
Tensile Strength @73 F, (ult)/(yld)D63812,500 (ult)psi
Tensile Modulus of Elasticity @73 FD638-psi
Tensile Elongation at Break @73 FD6388%
Flexural Strength @73 FD79016,000psi
Flexural Modulus of Elasticity @73 FD790450,000psi
Shear Strength @73 FD73213,000psi
Comprehensive Strength, (% Deformation) @73 FD69519,300 (10)psi
Comprehensive Modulus of Elasticity @73 FD695350,000psi
Hardness, Rockwell, Scale as noted @73 FD785(E45)-
Hardness, Durometer, Shore D @73 FD2240--
Izod Impact, (Notched) @73 FD256 Type A0.8ft-lb/in of notch
Coefficient of Friction, (Dry vs Steel) Dynamic-0.29-
Limiting PV, (with 4 to 1 factor of safety applied)--psi-ft/min
ThermalASTM Test MethodValueUnits
Coefficient of Linear Thermal Expansion @73 FE-831 (TMA)3.0 E-05in/in/F
Heat Deflection Temperature @264 psiD648680F
Tg-Glass transition termperature, (Amorphous)D3418-F
Melting Point, (VS=Vicat Softening Temp.)D3418-F
Continuous Service Temperature in Air, (Max.)--F
Thermal Conductivity-2.40BTU-in/hr-ft2-F
MechanicalASTM Test MethodValueUnits
Strength to Weight Ratio--ksi
Specific Gravity @73 FD7921.43-
Tensile Strength @73 F, (ult)/(yld)D63812,500 (ult)psi
Tensile Modulus of Elasticity @73 FD638-psi
Tensile Elongation at Break @73 FD6388%
Flexural Strength @73 FD79016,000psi
Flexural Modulus of Elasticity @73 FD790450,000psi
Shear Strength @73 FD73213,000psi
Comprehensive Strength, (% Deformation) @73 FD69519,300 (10)psi
Comprehensive Modulus of Elasticity @73 FD695350,000psi
Hardness, Rockwell, Scale as noted @73 FD785(E45)-
Hardness, Durometer, Shore D @73 FD2240--
Izod Impact, (Notched) @73 FD256 Type A0.8ft-lb/in of notch
Coefficient of Friction, (Dry vs Steel) Dynamic-0.29-
Limiting PV, (with 4 to 1 factor of safety applied)--psi-ft/min
ElectricASTM Test MethodValueUnits
Dielectric Strength, Short TermD149560Volts/mil
Volume ResistivityD2571E15 - 1E16ohm-cm
Dielectric Constant @10E6 HzD1503.6-
Dissipation Factor @10E6 HzD1500.003-
Flammability @3.1 mm unless notedUL94--
H2OASTM Test MethodValueUnits
Water Absorption, Immersion, 24 hoursD570(7)0.24% by weight
Water Absorption, SaturationD570(7)1.30% by weight