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| Parameter | Details |
|---|---|
| Chemical Name | Sodium Metaborate |
| CAS Number | Anhydrous: 7775-19-1; Hydrate (NaBO₂·4H₂O): 10555-76-7 |
| Molecular Formula | Anhydrous: NaBO₂; Tetrahydrate: NaBO₂·4H₂O |
| Molecular Weight | Anhydrous: 65.80 g/mol; Tetrahydrate: 137.86 g/mol |
| Physical Appearance | Anhydrous: White crystalline powder; Tetrahydrate: Colorless monoclinic crystals |
| Solubility | Highly soluble in water (exothermic dissolution); Insoluble in alcohol and ether |
| pH Value (1% Aqueous Solution) | ~12.0 (strongly alkaline) |
| Melting Point | Anhydrous: 966 °C; Tetrahydrate: Loses water at 130 °C, decomposes at high temperature |
| Primary Applications | 1. Textile Industry: Desizing agent, bleaching auxiliary for cotton fabrics2. Detergents & Cleaners: Builder for heavy-duty cleaners, corrosion inhibitor3. Ceramics & Glass: Flux in glass manufacturing, glaze component for ceramics4. Water Treatment: pH adjuster, boiler water conditioner5. Chemical Synthesis: Intermediate for borate compounds, catalyst in organic reactions |
| Safety & Hazards | - Strongly alkaline; Causes severe skin and eye irritation, corrosive to mucous membranes- Inhalation of dust may cause respiratory tract irritation- Avoid contact with acids (releases boron oxide fumes) |
| Storage Requirements | Store in airtight containers in a cool, dry, well-ventilated area; Separate from acids, moisture-sensitive materials; Protect from moisture absorption |
| Regulatory Notes | No strict global restrictions for industrial use; Compliance with local occupational safety standards required for handling |
