... 3.types: powder, ball, pellet, crackle High purity Alumina pellet 99.998%High purity alumina pellet, the raw material for sapphire crystal ... can provide different specifications of high purity alumina pellet material with the purity of 99.996-99.999%, density of 3.0-3 ... (YAG) and man-made gemstone, etc..High purity Alumina ball 99.998%High purity alumina ball, the raw material for sapphire crystal ...