Sodium silicate is the common name for a compound sodium metasilicate, Na2SiO3, also known as water glass or liquid glass. Sodium SilicateMolecular Formula: Na2SiO3CAS No.: 1344-09-8EINECS NO.: 215-687-4Specification:ItemStandardNa2O, %:22.68-23.46SiO2, %:75.04-75.82Na2O%+SiO2, %:98.5 Min.M:3.3-3.45 Sodium Silicate