... SiO2 and Na2O)It is mainly used as raw material to produce silica gel ,silica ,zeolite molecular sieve, silica ... sol and so on. It is also the raw material to produce detergent and soap .As water sofetener and ... machine industry, it is widely used in founding process, to made grinding wheel and used as metal protector agent. ... 0.002%maxMol rate: 2.0-2.2 The best sodium metasilicate pentahydrate