Sodium Metasilicate
Disodium Metasilicate
- CAS
- 6834-92-0
- EC
- 229-912-9
- Sectors
- Water & Wastewater Treatment, Building & Construction
Sodium metasilicate, also called sodium silicate, is a white crystalline powder with formula Na2SiO3 (anhydrous) or Na2SiO3·5H2O (pentahydrate) and molecular weight 122.06 g/mol (anhydrous). Density 2.4 g/cm³, melting point 1089°C; highly soluble in water forming alkaline solutions (pH 12-13), insoluble in alcohols. Hygroscopic, it decomposes in acids releasing silica; produced by fusing sodium carbonate with silica.
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Sodium Metasilicate
Applications
Used in detergents as a builder, in water treatment, adhesives, fireproofing, and as a silica source in coatings, catalysts, and cement formulations.
Safety & Risks
Highly corrosive; causes severe burns to skin and eyes, risk of blindness. Avoid acids; use PPE and ventilation. Hazard Class 8 for transport.
Packaging
In 25kg bags or drums with secure closures; for disposal, rinse triply and recycle or puncture packaging for landfill.