Sodium silicate is the common name for compounds with the formula (Na2SiO2)nO. A well-known member of this series is sodium metasilicate, Na2SiO3. Also known as waterglass or liquid glass, these materials are available in aqueous solution and in solid form.

Main uses: cements, passive fire protection, textile and lumber processing, refractories, water treatment, food preservation, automobiles, etc…