... . Physicochemical stability. 4. High quality refractory raw materials. Calcined kaolin clay Characteristics: 1. High refractoriness. 2. Physicochemical stability. 3. Bulk density ... .51.52.02.53.03.54.04.5Applications:Calcined kaolin clay is mainly used for manufacturing high-quality refractory products, refractory ... , ceramic fiber, precision casting sand, ceramics products, etc. Calcined kaolin clay