... quality Features: 1) This series of products are with high intensity, wear-resist, insulative, the surface is smooth and ... and blackAlumina balls,nozzles,substrates have the performances of high purity,good hermetical property,good hardness,low abrade,anti- ... they are the liner and grinding medium for various ceramic material, α-Al2O3 powder, flake alumina, kaolin, fusible corundum,porcelain enamel,dye ...