... Low density, neutral materials For supporting foundry and casting industry, we supply Ceramsite Foundry Sand (also ... Precoated sand;, Sodium silicon sand , Resin sand, Precision casting etc. Advantages:Spherical grain, low thermal expansion, good ... :Waterglass bonded sand, resin bonded sand, precision casting, Expendable Pattern Casting (EPC), Copper and Aluminium articles polishingChemical: Al2O3 ...