insulating bricks are a kind of highly efficient, energy saving, low-carbon,environmental protection advanced products which are manufactured according to ASTM standard. insulation materials in all types of industrial furnaces in the field of Metallurgy, Aluminum, Petrochemical, Ceramics, Power and Glass. They can be applied as heat insulation or no-melt erosion parts of the working layer. ITEM Improved Existing Material Al2O3 % 51.46 Fe2O3 % 0.82 Bulk density (g/Cm3) 0.66 Cold crushing strength MPa 2.04 Reheating linear change % -0.1 1230C*24Hr Thermal conductivity 400C 0.17 600C 0.19 800C 0.21