Thermal Properties ASTM PTFE PFA FEP ETFE Maximum Temp. °C 260° 260° 200° 150° Minimum Temp. °C -240° -200° -240° -190° Melting point °C 327° 305° 260° 267° Flame Rating UL 94 V-O V-O V-O V-O Mechanical Density(g/cm3) D-792 2.18 2.15 2.15 1.74 Tensile Strength (psi) D-638 2000-7000 4000-4500 2800-5000 6100-6800 Hardness shore D D-636 50-65 55-60 55 75 Shrink Ratio / 4:1 or 1.7:1 2:1 1.3:1 or 1.6:1   Electrical Dielectric Strength v/mm D-149 1400 2000 2000 1600 Volume Resistivity Ω·cm D-257 1.0×10,18 1.0×10,18 1.0×10,18 1.0×10,16   Unit exchange: 1volts/mil=0.001kV/0.0254mm=0.03937kV/mm 1kV/mm=1/0.03937volts/mil=25.40volts/mil 1 Mpa= 145.0377 psi...