... 3. Physicochemical stability. 4. High quality refractory raw materials. china clay,fire clay, china clay for paint , calcined kaolin clayCharacteristics:1. High refractoriness.2. ... 52.02.53.03.54.04.5 Applications:Calcined fire clay is mainly used for manufacturing high-quality refractory products, ... crucibles, ceramic fiber, precision casting sand, ceramics products, etc. Calcined china fire clay