Sodium Borate
Borax Anhydrate, borax
- CAS
- 1330-43-4
- EC
- 215-540-4
- Sectors
- Water & Wastewater Treatment, Building & Construction, Agriculture
Sodium Borate (CAS 1330-43-4), also known as borax or borax anhydrate, is a white crystalline powder in the salts and minerals group, described in its decahydrate form, and it is used in glass, ceramics, fertilizers, detergents, pharmaceuticals and cosmetics. Density 1.73 g/cm³, melting point 75°C (loses water), highly soluble in water forming alkaline solutions, and sourced from natural minerals or synthesis.
Typical Properties
| Molecular formula | B4Na2O7 |
|---|---|
| Molecular weight | 201.22 g/mol |
| Form | Solid |
| Color | White |
| Melting point | 741 °C |
| Boiling point | 1571 °C |
| Density | 2.367 g/cm³ |
| Water solubility | 26 g/L (20 °C) |
| Flash point | 1575°C |
| pH | 9.0-10.5 (25°C, 0.1M in H2O) |
| GHS signal word | Danger · Irritant / harmful, Health hazard |
| HS code | 28401100 |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Sodium Borate
Applications
Used in glass and ceramics as flux, detergents for cleaning, fertilizers for boron supply, pharmaceuticals as antiseptic, and in cosmetics for pH adjustment.
Safety & Risks
Irritates eyes and skin; reproductive toxins may impair fertility. Avoid ingestion causing gastrointestinal issues; non-combustible but decomposes releasing boron oxides. Hazard Class 8; use PPE.
Packaging
In 25kg bags or drums; store at 2-8°C; rinse triply for recycling or disposal in landfills.