Disodium Phosphate
Disodium Hydrogen Phosphate, Sodium Phosphate Dibasic
- CAS
- 7558-79-4
- EC
- 231-448-7
- Food Code
- E339
- Sectors
- Food & Nutrition, Pharma & Healthcare, Water & Wastewater Treatment
Disodium Phosphate (CAS 7558-79-4), also known as sodium phosphate dibasic, is a white granular powder that acts as a buffering and sequestering agent, maintaining pH balance in food processing, pharmaceutical formulations and industrial water systems.
Typical Properties
| Molecular formula | H3O4P.2Na |
|---|---|
| Molecular weight | 141.96 g/mol |
| Appearance | white granular powder |
| Form | powder |
| Color | White |
| Odor | odorless |
| Melting point | 250 °C |
| Density | 1.064 g/mL at 20 °C |
| Water solubility | >=10 g/100 mL at 20 °C |
| pH | 8.9-9.2 (25°C, 50g/L in water) |
| GHS signal word | Warning · Irritant / harmful |
| HS code | 28352200 |
| Grades available | Food Grade |
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.
Disodium Phosphate
Applications
Used in food processing, water softening, and detergents. In pharmaceuticals, it acts as an emulsifier and stabilizer. Industrial applications include electroplating and wastewater treatment.
Safety & Risks
Low toxicity; prolonged skin contact may cause mild irritation. Handle under clean, dry conditions to prevent caking.
Packaging
Delivered in 25–50 kg PE-lined paper bags. Store sealed, cool, and dry, away from acids and moisture.