Hydex® is a trade name for Polybutalyene terephalate.  Other trade names for Polybutalyene terephalate include Celanex®, Sustador, PBT, TECADUR™ PBT, Ultradur® and VALOX®.

MechanicalASTM Test MethodHydex 4101 PBTHydex 4101L (PTFE-Filled)Units
Strength to Weight Ratio---ksi
Specific Gravity @73 FD7921.361.36-
Tensile Strength @73 F, (ult)/(yld)D6387,500 (yld)7,200 (yld)psi
Tensile Modulus of Elasticity @73 FD638377,000380,000psi
Tensile Elongation at Break @73 FD63820040%
Flexural Strength @73 FD79012,000-psi
Flexural Modulus of Elasticity @73 FD790420,000390,000psi
Shear Strength @73 FD732--psi
Comprehensive Strength, (% Deformation) @73 FD69512,800 (10)-psi
Comprehensive Modulus of Elasticity @73 FD695--psi
Hardness, Rockwell, Scale as noted @73 FD785M72--
Hardness, Durometer, Shore D @73 FD2240---
Izod Impact, (Notched) @73 FD256 Type A1.00.7ft-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 MethodHydex 4101 PBTHydex 4101L (PTFE-Filled)Units
Coefficient of Linear Thermal Expansion @73 FE-831 (TMA)7.8 E-05-in/in/F
Heat Deflection Temperature @264 psiD648200195F
Tg-Glass transition termperature, (Amorphous)D3418--F
Melting Point, (VS=Vicat Softening Temp.)D3418428-F
Continuous Service Temperature in Air, (Max.)-221221F
Thermal Conductivity---BTU-in/hr-ft2-F
ElectricASTM Test MethodHydex 4101 PBTHydex 4101L (PTFE-Filled)Units
Dielectric Strength, Short TermD149400-Volts/mil
Volume ResistivityD2571.0 E+16-ohm-cm
Dielectric Constant @10E6 HzD150---
Dissipation Factor @10E6 HzD1500.001--
Flammability @3.1 mm unless notedUL94HB--
H2OASTM Test MethodHydex 4101 PBTHydex 4101L (PTFE-Filled)Units
Water Absorption, Immersion, 24 hoursD570(7)0.080.07% by weight
Water Absorption, SaturationD570(7)0.50-% by weight