... 2.Patent NO.200510017799.6 3.Cermic sand can replace zircon sand in many industry 4.Good price Using: ... steel foundries, Lost-foam, Precoated sand;, Sodium silicon sand , Resin sandCeramic Molding sand for foundry Al2O3≥75%Fe2O3≤5% ... 1g/cm3 Refractoriness: 1800 min coShape Ball Shape,Sand Shape Angle Factor≤1.1 very close to ... ball or Sand Shape Thermal expansion0.13%10 minutes at ...