performance Item Type used in air separation process used in coal gas heating furnace Al2o3（%） 20-30 60-65 Al2O3+ SiO2（%） ≥90 ≥90 Fe2O3（%） ≤1 ≤1.5 Size（mm） 10-12/12-14 16-18/20-25 Specific heat(J/kg.k) ≥836 ≥1000 Thermal Coefficient(w/m.k) 2.6-2.9 2.7-2.9 Temperature urgent change resistance（℃） 800 1000 Fire resistance（℃） 1550 1750 Wearing rate（%） ≤0.1 ≤0.1 Grade Mohs Hardness ≥6.5 ≥6.5 Compressive strength(N/Grain) 800-1200 1800-3200 Heaping Weight(kg/m3) 1300-1400 1500-1600 ★We can product catalytic combustion ceramic board follow customer’s request.