... hardness and slightly lower toughness than brown fused aluminium oxide,characte-rized by its high purity,strong grinding ... high-grade refractory materials,etc.2. White Fused Aluminum Oxide Polishing PowderChemical Composition(%) GRIT SIZEF280F1000JIS#800JIS#15001). CHEMICAL ANALYSIS ... Black & Green Silicon Carbide, White, Brown Fused Aluminum Oxide. The production and quality are in accord with GB, ...