... 0.0023%.....color white ……hardness(mohs) 9…….ture density 3.9Marterials: aluminaWhite aluminium oxide is electrically fused in the ... grade refractory materials,etc.Abrasives gradeGrit size: 16#,20#,24#30#,36#,46#,54#,60#,80#,100#,120#,150#, ... # 2000#,2500#,3000#,4000#Refractory grade:1-0mm,3-1mm,5-3mm,5-8mm -200mesh,-240mesh,-320meshPurposeSpecificationChemical Composition(%)Magnetic material content ...