... for refractory chamotte sand:16-30,30-60,etc mesh chamotte flour:200M-325mesh Mainly used for precision casting flint clay for refractory Characteristics of flint clay for ... , 30-80, 60-80,80-120, 10-20 (mesh)Size of Precision casting flour: -200, -250, -270, -325 (mesh)Features of flint clay for refractory:All of the ...