Udel® is a trade name for Polysulfone – a thermoplastic polymer known for toughness and stability at high temperatures.  Other trade names for Polysulfone are PSU 1000, Sustason PSU, TECASON® S, Thermalux® and Ultrason®.

MechanicalASTM Test MethodValueUnits
Strength to Weight Ratio--ksi
Specific Gravity @73 FD7921.24-
Tensile Strength @73 F, (ult)/(yld)D63810,200 (ult)psi
Tensile Modulus of Elasticity @73 FD638360,000psi
Tensile Elongation at Break @73 FD63830%
Flexural Strength @73 FD79015,000psi
Flexural Modulus of Elasticity @73 FD790400,000psi
Shear Strength @73 FD7329,000psi
Comprehensive Strength, (% Deformation) @73 FD69513,000 (10)psi
Comprehensive Modulus of Elasticity @73 FD695375,000psi
Hardness, Rockwell, Scale as noted @73 FD785M82 (R128)-
Hardness, Durometer, Shore D @73 FD2240D80-
Izod Impact, (Notched) @73 FD256 Type A1.3ft-lb/in of notch
Coefficient of Friction, (Dry vs Steel) Dynamic---
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)3.1 E-05in/in/F
Heat Deflection Temperature @264 psiD648340F
Tg-Glass transition termperature, (Amorphous)D3418374F
Melting Point, (VS=Vicat Softening Temp.)D3418-F
Continuous Service Temperature in Air, (Max.)-300F
Thermal Conductivity--BTU-in/hr-ft2-F
ElectricASTM Test MethodValueUnits
Dielectric Strength, Short TermD149425Volts/mil
Volume ResistivityD2575.0 E+16ohm-cm
Dielectric Constant @10E6 HzD1503.1-
Dissipation Factor @10E6 HzD1500.001-
Flammability @3.1 mm unless notedUL94HB-
H2OASTM Test MethodValueUnits
Water Absorption, Immersion, 24 hoursD570(7)0.30% by weight
Water Absorption, SaturationD570(7)0.60% by weight