Foundry sands, also called Calcined Kaolin and Flint clay Packing: 25kg/plastic woven bag or paper complex bag, 1MT bag Calcined kaolinite (CK) for precision casting is one kind of natural mullite, made of pure material through high temperature at 1,300°C calcined, and suitable for precision casting.The products have been processed by Japanese equipment with special techniques and for excellent ...