... 2.5mm3) Two colors: white and black Alumina balls,nozzles,substrates have the performances of high purity,good hermetical ... industry, they are the liner and grinding medium for various ceramic material, α-Al2O3 powder, flake alumina, kaolin, fusible corundum ... ,porcelain enamel,dye,ceramic glaze,dope,printing ink,special glass,various ball mill machines.