ceramisite sand(ceramic foundry sand) ï¼?cerabeads(Artificial ceramic sand ) is a kind of high quality refractory for casting, made with quality alumina through process as calcination, electric melting, granulation and screening. It serves as a very good pre-coated molding sand, an ideal substitute for zircon sand or chrome sand. Ceramite firstly appeared in the 80s of last century, in ball-shaped granules made by calcination. In the 1990s it was applied to casting industry instead of zircon sand in USA and then Japan. Chemical composition: Al2O3≥75%Fe2O3<2%TiO2≤3.8%SiO2>14% Refractoriness: >1800 Deg. C Thermal expansion: <0.13%(heated at 1000 Deg. C for 10 minutes) Thermal conductivity: (1200 Deg. C)5.72W/M.K PH: 7_8 Bulk density: 1.95_2.05(g/cm3) Angle factor; <1.1 Shape: ball-shaped Size: 6 â?? 720 mesh (dia.: 0.053 â?? 3.35mm, grade as per user&＃039;s request)