... clientphysical and chemical indicator Fire clay brick SK-32 Item StandardAI2O3(%)30Fe2O3 (%)3Refractoriness (SK)32Refractoriness under load, 0.2MPa, ... °C (%)0.6 Fire clay brick SK-34 Item StandardAI2O3(%)38Fe2O3 (%)2.5Refractoriness (SK)34Refractoriness under load, 0.2MPa, Ta ... °C (%)0.6 Fire clay brick SK-36 Item StandardAI2O3(%)50Fe2O3 (%)2Refractoriness (SK)36Refractoriness under load, 0.2MPa, Ta ...