... oxide powder for refractories 2.Al2O3 content: 98.6%min 3.attrition index:5-10 4.we are a manufacture basic raw material for ... corrosion resistance, such as high- alumina refractories, equipments and tools for polishing and grinding, spark plug, electroceramics, electrolytic aluminium,and ... as refractory material, alumina, aluminum hydroxide, high temperature aluminum oxide and white corundum, etc..