... low. 8. The specification standards. Advantages of flint clay for refractory: 1. Easy out of shell. 2. No deformation. 3. ... -200, -250, -270, -325 (mesh)Features of flint clay for refractory:All of the chemical composition is equably.Composition and size ... even better fuctionPhysical and chemical index of flint clay for refractory: Physical and chemical indexItem/ GradeIndexCSM-45CSM-43Al2O3%45-4643- ...