... stability. 4. High quality refractory raw materials. Calcined flint clay,Refractory chamotte,Flint clay Features and advantages:1. High refractoriness.2. Physicochemical stability ... 51.52.02.53.03.54.04.5 Applications:Calcined flint clay is mainly used for manufacturing high-quality refractory products, ... fiber, precision casting sand, ceramics products, etc. Refractory calcined flint clay