Technical Data Breaking Strength at Room Temperature 900Mpa Fracture Toughness at Room Temperature 6.0-8.0 Mpa.m1/2 Volume Density 3.20-3.4g/cm3 Volume Resistivity at Room Temperature 1014Ω.cm Relative Dielectric Constant at Room Temperature 6-7 Heat Conductivity 23-25W/m-k Thermal Expansion Coefficient 3.110-6/ Hardness HRA92-94 Main Performance Indexes of Silicon Nitride Ceramics: Performance Reactive Sintering Silicon Nitride Normal Pressure Sintering Silicon Nitride The Companys Hot Pressed Sintering Silicon Nitride Volume Density g/cm3 2.21 3.15 3.2~3.3 Bending StrengthMpa 137.3 490.3 900 Fracture Toughness (Mpa·m1/2) 2.17 4.71 6.0~8.0 Hardness (HRA) 87.0 92.0~94.0 Heat Conductivity Coefficient (W/m·k) 5.44 12.56 23~25 Thermal Expansion Coefficient 10-6 (RT~1200) 3.2 3.2 2.95~3