... and thermal conductivity. It has many advantages compared with other foundry s Specifications1. Patent No.2005100177 2.Patent NO.200510017799.6 ... , Precoated sand;, Sodium silicon sand , Resin sandCeramic Moulding sand for foundry Al2O3≥75%Fe2O3≤5% Tio2 :2.5%-3.5% SiO2 ... sand;, Sodium silicon sand , Resin sand, Precision casting etc Ceramsite Foundry Sand