... -0.5 Apparent Porosity(%)<24Cold crushing strength (Mpa)>24.5High-alumina refractory brick1. LZ-75AL2O3 (%)>75Refractoriness>1790Refractoriness ... (Mpa)>39.2 Fire clay brick SK-32 ItemStandardAI2O3(%)30Fe2O3 (%)3.5Refractoriness (SK)32Refractoriness under load,0.2MPa, Ta ... 1000°C (%)0.6 Fire clay brick SK-36 ItemStandardAI2O3(%)50Fe2O3 (%)2Refractoriness (SK)36Refractoriness under load,0.2MPa, Ta, ...