Ceramic Specifications Property Unit 60% Alumina 75% Alumina 90% Alumina 96% Alumina 99+% Alumina Steatite Cordierite Zirconia Density g/cc 3 3.2 3.4 3.6 3.8 >2.6 2.3 6 Hardness Mohs 7.5 7.5 7.5 8 8 7 6.5 8 Flexural Strength kpsi 25 30 30-40 40-45 >45 15 9 >110 Compressive Strength kpsi 65 70 250-300 280-300 >300 60 30 >300 Factor of Expansion 10–6/0C 7.5 8 8 8 8 8 1.3 10 Dielectric Constant 6 6.1 8.1 9.2 9.7 5.5 5 12.3 Dielectric Strength kV/mm 10 10 15 15 17 >9 13 17 Thermal Conductivity W/m-k 2.5 12 18 23 24 2.5 2.5 3 Maximum Operating Temp. 0C 1100 1150 1500 1600 1700 1200 1100 2200 *The data offered here is for comparative purposes only, and is not to be construed as absolute engineering data. Actual data may vary due to product configuration. The data does not represent a warranty for which we assume legal responsibility.