... abrasive 5. The usual size are 10-20mesh, 20-30mesh, 20-40mesh, 30- 60mesh, 60grit, 80grit, 120grit, ... require. 6. Chemical property: SiO2: 35.0-40.0% Al2O3: 16.0-22.0% FeO: ... Mesh Micron Typical application10/20 10-20 2000-850 water filtration media paving stone20/40 20-40 850-425 sand blasting ... media, painting30/60 30-60 600-250 sand blasting media, painting40/60 40 ...