Sodium Tripolyphosphate
Sodium Triphosphate
- CAS
- 7758-29-4
- EC
- 231-838-7
- Food Code
- E451
- Sectors
- Food & Nutrition, Water & Wastewater Treatment
Sodium Tripolyphosphate (CAS 7758-29-4) is a sodium polyphosphate salt supplied as a white powder, granule or crystal, hygroscopic and highly soluble in water, used in food as a preservative and emulsifier, in meat processing for moisture retention, in detergents as a builder, and in water softening. Density 2.52 g/cm³, decomposes above 100°C; highly soluble in water forming alkaline solutions. Hygroscopic; produced by heating sodium phosphate mixtures.
Typical Properties
| Molecular formula | H5O10P3.5Na |
|---|---|
| Molecular weight | 367.86 g/mol |
| Appearance | white or colourless crystals, granules or powder |
| Form | Powder/Solid |
| Color | White |
| Odor | Odorless |
| Melting point | 622 °C |
| Density | 2.52 g/cm³ |
| Water solubility | 20 g/100 mL (20 °C) |
| pH | 9.0-10.0 (25°C, 1% in H2O) |
| GHS signal word | Warning · Irritant / harmful |
| HS code | 28353100 |
| Grades available | Food Grade, Technical 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.
Sodium Tripolyphosphate
Applications
Used in detergents as builders, food as preservative/emulsifier, water softening, ceramics, and meat processing for moisture retention.
Safety & Risks
Irritates skin, eyes; harmful if swallowed or inhaled. Avoid dust; use PPE; low environmental risk.
Packaging
In 25kg bags with liners; offer rinsed containers for recycling or puncture for landfill.