The product have good refractoriness under load and thermal shock stability,which have been applied in over ten hot blast stove at Laiwu Steel Corporation,Weifang Iron and Steel Group Corporation etc. Typical technical specification: Model:RN-42 AL2O3:Min42% Fe2O3:Max1.7% Refractoriness:Min1750C Bulk density:Min2.15g/cm3 Apparent porosity:Max24%