... . 2.purity 99.8% 3.with ISO 9011-2000 certificated al2o3 99.8%,calcined grade Calcined alumina for ceramics, refractories and ... partied size distributions.We provide alumina products are used in a wide grange of refractory applications, such as: fired shapes, ... properties allow its as a metal polish and buffer in addition to surface that require a specific finish aluminuim oxide powder,99.8%,1 ...