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Typical Specifications of Parylene  C PARYLENE C VALUE ASTM METHOD GENERAL Density (g/cm) 1.289 D1505 Refractive index 1.639 ELECTRICAL Dielectric strength (voltage breakdown) volts/mil 5,600 volts D149 Dielectric constant   D150 60 Hz 3.15   1 kHz 3.10 1 MHz 2.95 Dissipation factor   D150 60 Hz 0.020   1 kHz 0.019   1 MHz 0.013 Dielectric strength @ 25µm, short time MV/m 220 D149 Dielectric strength @ 25µm, step-by-step MV/m 185 D149 Volume resistivity @ 23ºC, 50% RH, ohms 8.8 x 1016 D257 Surface resistivity @ 23ºC, 50% RH, ohms 1 x 1014 D257 MECHANICAL Tensile modulus, GPa 3.2 D882 Tensile strength, MPa 70 D882 Tensile strength, psi 10,000 D882 Yield strength, MPa 5.5 D882 Elongation to break, % 200 D882 Yield elongation, % 2.9 D882 Coefficient of  friction-static 0.29 D1894 Coefficient of  friction-dynamic 0.29 D1894 Rockwell hardness R80 D785 THERMAL Melting point, ºC 290ºC Linear coefficient of expansion (10-5/ºC) 3.5 D696 Thermal conductivity @ 25ºC (watts/meter-Kelvin) 0.082 C177 Specific heat @ 20ºC cal/g/ºC 0.17   BARRIER Water absorption, % (24 hr) 0.06 (.029") D570 Water vapor transmission @ 37ºC (ng) 0.0004 D570 Gas permeability cc-mil/100  in 2 - 24 hrs   N2 0.6   O2 5   CO2 14 H2 110 Moisture vapor transmission gm-mil/100 in - 24 hrs 1