... :40%-48%. 2. High refractoriness. 3. Physicochemical stability. 4. High quality refractory raw materials. Calcined kaolin,Kaolin clayFeatures and advantages:1. High refractoriness.2. Physicochemical ... for manufacturing high-quality refractory products, refractory castable, sagger, kiln furniture, crucibles, ceramic fiber, precision casting sand, ceramics products, etc. Calcined kaolin clay