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The alumina bubble is a hollow spherulitic heat-insulation materials, which is made by electro fusing method. It is noted for its light-weight, heat-resistance, close pore. It is an ideal filler for high-temperature furnaces and an excellent aggregate of light weight castable refractory.
Index PropertiesGuarantee ValueTypical ValueChemical composition (%)Al2O3≥9999.51SiO2≤0.20.14Fe2O3≤0.10.05Na2O≤0.40.25Packing 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