... 7% 0.3um -74um,120-800mesh polishing alumina powder 1.for ceramics,refractories and surface treatment2. 99.0 ... .ISO 9001-2000we are specifically in supplying alumina powder,99.0% -99.8%,0.3-74um ... have a trade company,can produceand export alumina powder at the same time.We do alumina ... much for your attation.This product is featured with white powder, loose massive, easy tocrush, stabilityin the high ...