Physical Properties of Beryllium Copper: Properties Measurement Density 8.25g/c3 0.298lb/in3 Coefficient of Thermal Expansion 17 x 10-6 per C 9.5 x 10-6 per F Electrical Conductivity Solution heat-treated Heat-treated to maximum hardness Heat-treated to maximum conductivity 16 to 18 percent (IACS) 20 to 25 percent (IACS) 32 to 38 percent (IACS) Electrical Resistivity at 20°C Solution heat-treated Heat-treated to maximum hardness Heat-treated to maximum conductivity 9.5 to 10.8 microhm cm 6.9 to 8.6 microhm cm 4.6 to 5.4 microhm cm Temperature Coefficient of Electrical Resistance, from 0°C to 100°C Heat-treated to maximum conductivity 0.0013 per °C Thermal Conductivity Solution heat-treated Precipitation hardened 0.20 cal./cm2/cm./sec./°C 0.25 cal./cm3/cm./sec./°C Specific Heat 0.1 Modulus of Elasticity Tension (Young's modulus) Torsion (Bulk or shear modulus) 18 to 19 x 106lb./sq. inch 6.5 to 7 x 106lb./sq. inch Temperature coefficient of elastic modulus Tension, from -50°C to 50°C Torsion, from -50°C to 50°C -0.00035 per °C -0.00033 per °C