Mechanical Properties & Physical Properties CF-5 CD-5 CS-5 CN-5 SI-5 Tensile strength MPa 100~200 >400 >500 >550 >500 Yield strength MPa * >220 >300 >350 >270 Elongation % * > 18 > 20 > 5 > 15 Brinell hardness H B 90~130 130~170 150~170 200~230 140~180 Modulus of elasticity N/mm2 80000~ 90000 120000~ 130000 130000~ 140000 130000~ 140000 * Specific weight 7.8 7.8 8.0 8.2 8.0 Thermal conductivity J/cm,sec,℃ 0.209 0.209 0.209 0.278 0.209 Poisson’s ratio 0.27 0.33 0.36 0.37 0.36 Specific heat (observed) J/g・℃ 0.4598 0.4556 0.4867 0.4867