Material Specifications Chemical Composition Steatite Cordierite SiO2 62 - 63 % 51 % AlO3 7 - 8 % 33 % Fe2O3 .77 - 0.80 % 2.1 % FiO2 1.0 % 0.5 % CaO 2.0 % 1.4 % Na2O 1.5 % - MgO 19.5 % 10.1 % K2O 1 - 2 % - Mechanical Properties Steatite Cordierite Color Off White Brown / Yellow Water Absorption 0 0 Density 2.6 2.0 Compressive Strength N/mm2 900 320 Tensile Strength N/mm2 50 - Flexural Strength N/mm2 130 65 Coefficient of Thermal Expansion 8 x106 .6 x106/K Thermal Conductivity w/m0K 2.5 1.8 Safe Use Temperature 1000oc 1000oc Electrical Properties Steatite Cordierite Loss Factor .014 .022 Dielectric Strength 11kv/mm 5kv/mm Volume Resistivity 20oc 1x1013 1x1012   Kiln Insulator Precision Switch Parts Miscellaneous Shapes