the purity of Cr2O3 is high to 99% and above, the impurity content of Fe2O3 and SiO2 is very low (all ≤ 0.2%), the water-soluble matter is very low (0.3%), the residue of D50 (2-8) is very low (≤ 0.5%), and the natural bulk density is 1.2~1.5g/cm3. Large particle size, small particle gap, easy to pound forming, better density. Save labor and materials, less wear and tear to the machine during use.