Sodium Metasilicate Pentahydrate
Water Glass Pentahydrate
- CAS
- 10213-79-3
- EC
- 600-021-3
- Sectors
- Water & Wastewater Treatment, Textiles, Leather & Paper
Sodium metasilicate pentahydrate is a white crystalline powder or granules with formula Na2SiO3·5H2O and molecular weight 212.14 g/mol. It has a density of about 1.75 g/cm³, melting point around 72°C (loses water), highly soluble in water forming strongly alkaline solutions (pH 12-13), and insoluble in alcohols. Hygroscopic, it decomposes in acids releasing silica gel; produced by crystallizing sodium metasilicate solution.
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Sodium Metasilicate Pentahydrate
Applications
Used in detergents and cleaners as a builder and pH adjuster; in water treatment for corrosion inhibition; in adhesives, fireproofing, and textiles; in laundry, dairy, metal, and floor cleaning; in paper deinking and as a buffering agent in cosmetics.
Safety & Risks
Highly corrosive, causes severe skin burns, eye damage, and respiratory irritation; do not breathe dust or vapors. Avoid contact with acids or metals; wear protective gloves, clothing, and eye/face protection. Hazard Class 8; may be harmful if swallowed or inhaled; ensure good ventilation.
Packaging
Packaged in 25kg polypropylene bags or drums with inner liners; store in tightly closed containers in cool, dry areas to prevent moisture absorption.