... strength (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-34 ItemStandardAI2O3(%)38Fe2O3 (%)2.5Refractoriness (SK)34Refractoriness under load,0.2MPa, Ta, ... at 1000°C (%)0.6 Fire clay brick SK-36 ItemStandardAI2O3(%)50Fe2O3 (%)2Refractoriness (SK)36Refractoriness under load,0.2MPa, Ta, (°C ...