... , Precoated sand;, Sodium silicon sand , Resin sand, Precision casting etc. Advantages:Spherical grain, low thermal expansion, good anti-breakness ... Application:Waterglass bonded sand, resin bonded sand, precision casting, Expendable Pattern Casting (EPC), Copper and Aluminium articles polishingChemical: Al2O3: 70 ... mesh; 170 meshPacking: 25kg/bag or others AFS:20-150 Ceramic Foundry Sand For Casting