Tetrasodium Pyrophosphate (TSPP)
TSPP
- CAS
- 7722-88-5
- EC
- 231-767-1
- Food Code
- E450
- Sectors
- Food & Nutrition, Water & Wastewater Treatment, Textiles, Leather & Paper
Tetrasodium Pyrophosphate (TSPP) (CAS 7722-88-5) is a sodium phosphate salt and the food additive E450, available as a white crystalline powder, colorless crystals or granules, and used as a buffering, emulsifying and dispersing agent in food, cleaning and water treatment. Density 2.53 g/cm³, melting point 988°C, highly soluble in water (3.16 g/100mL cold, 40.26 g/100mL boiling), alkaline pH; hydrated form Na4P2O7·10H2O loses water at 93.8°C.
Typical Properties
| Molecular formula | H4O7P2.4Na |
|---|---|
| Molecular weight | 265.9 g/mol |
| Appearance | white crystalline powder or colourless crystals |
| Form | Granular |
| Color | White |
| Odor | Odorless |
| Melting point | 988 °C |
| Boiling point | 93.8 °C |
| Density | 2.534 g/cm³ |
| Water solubility | Soluble in water. Insoluble in ethyl alcohol. |
| GHS signal word | Warning · Corrosive, Irritant / harmful |
| HS code | 28353990 |
| 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.
Tetrasodium Pyrophosphate (TSPP)
Applications
Used as buffering/emulsifier/dispersing/thickening agent in food (chicken nuggets, pudding, crab meat, canned tuna, soy meats, cat food); tartar control in toothpaste/floss; ionic dispersant for low viscous solutions; electroactive media for exfoliation in batteries; wool de-fatting, bleaching, water treatment, laundry/metal cleaning; in poultry scalding.
Safety & Risks
Corrosive, causes burns/eye damage/irritation; toxicity twice table salt orally; hydrolyzes to phosphate/sodium ions; may lead to environmental eutrophication issues. Avoid acids/metals; stable but light-sensitive; Hazard Class 8; prolonged exposure causes respiratory problems.
Packaging
Supplied in 50 lb kraft paper bags with polyethylene moisture barriers or 2000 lb bulk bags for industrial shipments, as detailed in industry product info.