HDPE High Density Polyethylene is a polyethylene thermoplastic made from petroleum.  Some trade names for this material include Densetec High Density, Hitec® HDPE, Orthoform®, Playboard® HDPE, Polycarve™, Polystone® G, Sanalite®, Sanatec® HDPE, Sanatec® Lite HDPE, Seaboard® HDPE, Seaboard® Lite HDPE, Seaboard® Utility, Starboard®Tuff Sheet, TECAFINE® HDPE.

MechanicalASTM Test MethodValueUnits
Strength to Weight Ratio-4.9ksi
Specific Gravity @73 FD7920.94-
Tensile Strength @73 F, (ult)/(yld)D6384,600 (ult)psi
Tensile Modulus of Elasticity @73 FD638170,000psi
Tensile Elongation at Break @73 FD63855%
Flexural Strength @73 FD7901,400psi
Flexural Modulus of Elasticity @73 FD790200,000psi
Shear Strength @73 FD7323,380psi
Comprehensive Strength, (% Deformation) @73 FD6954,570 (10)psi
Comprehensive Modulus of Elasticity @73 FD695-psi
Hardness, Rockwell, Scale as noted @73 FD785--
Hardness, Durometer, Shore D @73 FD2240D69-
Izod Impact, (Notched) @73 FD256 Type A3.0ft-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)1.3 E-04in/in/F
Heat Deflection Temperature @264 psiD648151F
Tg-Glass transition termperature, (Amorphous)D3418-F
Melting Point, (VS=Vicat Softening Temp.)D3418-F
Continuous Service Temperature in Air, (Max.)-180F
Thermal Conductivity--BTU-in/hr-ft2-F
ElectricASTM Test MethodValueUnits
Dielectric Strength, Short TermD149500Volts/mil
Volume ResistivityD2571.0 E+15ohm-cm
Dielectric Constant @10E6 HzD150--
Dissipation Factor @10E6 HzD150--
Flammability @3.1 mm unless notedUL94--
H2OASTM Test MethodValueUnits
Water Absorption, Immersion, 24 hoursD570(7)0.03% by weight
Water Absorption, SaturationD570(7)-% by weight