Ertalyte® is a trade name for the thermoplastic polymer resin, polyethylene terephthalate.  Other trade names for this material are Ensitep® PET, Sustadur PET, TECAPET™ PET.

Mechanical ASTM Test Method Value Units
Strength to Weight Ratio - - ksi
Specific Gravity @73 F D792 1.41 -
Tensile Strength @73 F, (ult)/(yld) D638 12,400 (ult) psi
Tensile Modulus of Elasticity @73 F D638 460,000 psi
Tensile Elongation at Break @73 F D638 20 %
Flexural Strength @73 F D790 18,000 psi
Flexural Modulus of Elasticity @73 F D790 490,000 psi
Shear Strength @73 F D732 8,000 psi
Comprehensive Strength, (% Deformation) @73 F D695 15,000 (10) psi
Comprehensive Modulus of Elasticity @73 F D695 420,000 psi
Hardness, Rockwell, Scale as noted @73 F D785 M93 (R125) -
Hardness, Durometer, Shore D @73 F D2240 D87 -
Izod Impact, (Notched) @73 F D256 Type A 0.5 ft-lb/in of notch
Coefficient of Friction, (Dry vs Steel) Dynamic - 0.2 -
Limiting PV, (with 4 to 1 factor of safety applied) - 3,160 psi-ft/min
Thermal ASTM Test Method Value Units
Coefficient of Linear Thermal Expansion @73 F E-831 (TMA) 3.3 E-05 in/in/F
Heat Deflection Temperature @264 psi D648 240 F
Tg-Glass transition termperature, (Amorphous) D3418 - F
Melting Point, (VS=Vicat Softening Temp.) D3418 491 F
Continuous Service Temperature in Air, (Max.) - 210 F
Thermal Conductivity - 2.0 BTU-in/hr-ft2-F
Electric ASTM Test Method Value Units
Dielectric Strength, Short Term D149 385 Volts/mil
Volume Resistivity D257 5.5 E+14 ohm-cm
Dielectric Constant @10E6 Hz D150 - -
Dissipation Factor @10E6 Hz D150 - -
Flammability @3.1 mm unless noted UL94 HB -
H2O ASTM Test Method Value Units
Water Absorption, Immersion, 24 hours D570(7) 0.07 % by weight
Water Absorption, Saturation D570(7) 0.90 % by weight