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Powder of corundum:
+ Chemical composition: Al2O3 100% (Al: 52.93%, O: 47.07%)
+ Hardness: 9 MOH
+ Specific gravity: 3.9 – 4.1 g/cm3
+ Fineness: three different fineness are needed:
d97=120 mesh and d97=180 mesh and d97=220 mesh
+ Purchase quantity: 30 MT
