Calcined Alumina It is white crystalline powder.It has high chemical purity,steady property,well sintering property.It is the basic raw material of high-grade ceramics and refractory products which are wear resistanct,heatproof,and corrosion-resistant,etc.The active a-Al203 us characterized by low absorbing water rate,well fluidity,high sintering density and high strength under high temperature.It is specially used for producing unformed refractory materials. Chemical data sheet Size Al2O3 Fe2O3 Na2O SiO2 Density Loss on lgnition a-Al203 % % % % g/cm3 % % AF601-C 99.5 0.04 0.15 0.06 3.96 0.10 96.0 AF 620HC 99.5 0.03 0.15 0.10 3.95 0.10 95.0 AF 603DC 99.5 0.03 0.25 0.06 3.95 0.10 94.0 AF 604ZC 99.5 0.03 0.30 0.06 3.95 0.10 93.0 . Note: The median particle size of above product can be made into special size according to your requirement. Also we can adjust the other specification according to your requirement. 25 kg / bag/50kg/bag/ton bag.