Specifications Chemical Al2O3: 70% min ; Fe2O3: 5% max TiO2:5%max SiO2 (%)：8~20% MgO Content (%)：0.5%max CaO (%):0.5%max K2O:0.5%max Na2O:0.5%max Grain type: ball, spherical Angularity: 1.1 max, similar to ball Packing density: 1.95-2.05 g/cm3 Refractoriness: 1790 C min Thermal expansion: 0.13% (10 min at 1000 C ) Size: 10-14 mesh; 20-30 mesh; 30 mesh; 40-70 mesh; 100-140 mesh; 170 mesh  Description Ceramic Foundry sand is made from fine bauxite, by re-fused and blown to ball type. With advantage of fine surface smooth finish and air permeability, it is a new type casting material for precision casting, coated sand and self hardening sand etc. Advantages Spherical grain, low thermal expansion, good anti-breakness, well refractory, low density, neutral materials   Application Waterglass bonded sand, resin bonded sand, precision casting, Expendable Pattern Casting (EPC), Copper and Aluminium articles polishing   Packing 25kg/bag or others