... color white ……hardness(mohs) 9…….ture density 3.9Marterials: aluminaWhite aluminium oxide is electrically fused ... #,24#30#,36#,46#,54#,60#,80#,100#,120#,150#,180#,220#Micropowder:240#,280#, ... 2500#,3000#,4000#Refractory grade:1-0mm,3-1mm,5-3mm,5-8mm -200mesh,-240mesh,-320mesh PurposeSpecificationChemical Composition ... .060.280.090.0021180-220990.080.300.100.0018micropowder240-400098.50.10.400.15—Refractory ...