Specification Product name Sodium silicate CAS 1344-09-8 Molecular formula Na2SiO3 Molecular weight 122.06 EINECS 215-687-4 Melting point 1410 C(lit.) Boiling point 2355 C(lit.) Density 2.33 g/mL at 25 C(lit.) Form Colorless liquid Water Solubility very slightly soluble cold water Application It is mainly used as raw material for adhesives, silica gel and silica, filler for soap industry and rubber waterproof agent Sodium silicate, commonly known as sodium silicate, is a water-soluble silicate, and its aqueous solution is commonly known as water glass, which is a mineral binder. Water glass commonly used in buildings is the aqueous solution of sodium silicate (Na2O nSiO2).