Silica Sand 1.very high purity, 2.very low Fe ion, Na+ ion, Cl- ion. Name of product: High purity silica sand Size: 20-40mesh, 30-60mesh, 60-200mesh Sepcifications: SiO2 99.9% min; Al2O3 300ppm max; Fe2O3 20ppm max.;CaO 20ppm max; MgO 10ppm max; Fe2+ 3ppm max; Na+ 3ppm max; Cl- 3ppm max.