Alumina Bubble,High Purity and Low Bulk density,Al2O3 99%min Alumina BubbleIndexPropertiesGuarantee valueTypical valueChemical composition (%)Al2O399min99.51SiO20.2max0.14Fe2O30.1max0.05Na2O0.4max0.25Packing density (g/cm3)0.5-1.00.74Damaged rate(%)≤1512Refractoriness(°C)1800Particle size5-0.2mm, 0.2-1mm,1-3mm,3-5mmTest standardGB/T3044-89Packing20kg/plastic bag(Dampproof)UsageRefractories