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Physical and Mechanical Properties PROPERTIES1 METHOD OR CONDITIONS PARYLENE C EPOXIES2 SILICONES2 URETHANES2 Secant modulus, psi ASTM D882-56T @ 1% strain 400,000 350,000 900 1,000-10,000 Tensile strength, psi ASTM D882-56T @ 10% strain/min 10,000 4,000-13,000 800-1000 175-10,000 Yield strength, psi ASTM D882-56T @ 10% strain/min 8,000 Elongation to break, % ASTM D882-56T @ 10% strain/min 200 3-6 100 100-1,000 Yield elongation, % ASTM D882-56T @ 10% strain/min 2.9 Density, gm/cc ASTM D1505-57T 1.289 1.11-1.40 1.05-1.23 1.10-2.5 Index of refraction, N 23 Abbe refractometer 1.639 1.55-1.61 1.43 1.50-1.60 Water absorption, 24 hrs ASTM D570-57T 0.06 0.08-0.15 12 (7 days) 0.02-1.5 Rockwell hardness ASTM D785-65 R80 M80-M110 40-45 (shore A) 10A-230 (shore) Coefficient of friction: ASTM D1894-63 Static 0.29 Dynamic 0.29 1Properties  measured on parylene films, 0.001-0.003 inch thick, except where  specified. 2Properties depend somewhat on deposition  conditions.