... aluminium oxide is electrically fused in the furnace with high grade bayer processed alumina as raw material..It has high purity ... coating, medium body for chemical industry,special ceramics and high-grade refractory materials,etc.Abrasives gradeGrit size: 16#,20#,24#30 ... #,600#,800#,1000#,1200#,1500# 2000#,2500#,3000#,4000#Refractory grade:1-0mm,3-1mm,5-3mm,5-8mm -200mesh,-240mesh ...