Properties Test Method Unit Values Physical Properties Specific Gravity ASTM D792 - 1.25 Mold shrinkage ASTM D955 % 0.3 - 0.6 Rockwell Hardness ASTM D785 R-Scale 110 Water Absorption ASTM D570 % 0.2 Mechanical Properties Tensile Strength at Yield ASTM D638 MPa (kgf/cm²) 50 (510) Tensile Strength at Break ASTM D638 MPa (kgf/cm²) 28 (286) Elongation at Break ASTM D638 % 140 Flexural Strength at Yield ASTM D790 MPa (kgf/cm²) 73 (745) Flexural Modulus ASTM D790 MPa (kgf/cm²) 2100 (21430) Izod Impact Strength ASTM D256 (Notched, @23℃) J/m (kgf-cm/cm) 100 (10.2) Thermal Properties Heat Distortion Temperature ASTM D648 (@ 0.455 MPa) ℃(℉) 70 (158) Vicat Softening Temperature ASTM D1525 (@ 1 kg load) ℃(℉) 83 (181) Glass Transition Temp.(Tg) DSC method ℃(℉) 180 (176) Optical Properties Haze ASTM D1003 % < 1 Total Transmittance ASTM D1003 M% 91 Electrical Properties Dielectric Strength ASTM D149 (short-time, 500V/s) kV/mm 15 Volume Resistivity ASTM D257 Ω·cm 10 Dielectric Constant ASTM D150 (@ 1MHz) - 2.5 Dissipation Factor ASTM D150 (@ 1MHz) - 0.023