... 2,Low thermal expansion rate 3,high refractoriness Ceramic foundry sand ,called ceramisite sand,china cerabeads and cerasand ... permeability, it is a new type casting material for precision casting, coated sand and self hardening sand ... Waterglass bonded sand, resin bonded sand, precision casting, Expendable Pattern Casting (EPC), Copper and Aluminium articles casting treatment. Ceramic foundry sand