... /70level 4.Anti-static, rare from dust. High content 99% white corundum Product introduction Product introduction white corundum industrial alumina ... chemical composition %Al2O3 Na2O magnetic material % SiO2abrasiveAbrasive add # - 80 # 99.4 or 0.4-0.03 or less or less90 ... strictly prohibited to iron residual sand homework; 6, after pickling steps to impurities. Edit this section USES for example 1, ...