Sodium phosphate
CAS 7601-54-9
EC 231-509-8
Formula H3O4P.3Na
MW 163.94 g/mol
Salts & Minerals Water TreatmentFood & NutritionTextile, Leather & PaperBuilding & Construction Chelation & SequestrationFlame RetardancypH Regulation & BufferingCleaning & DegreasingPreservation & Biocide
Description
Sodium phosphate (Na3PO4, CAS 7601-54-9) is an inorganic salt commercially known under names including Tromete and Dri-Tri, and approved as food additive E339iii in the EU. It is the trisodium form of phosphoric acid and belongs to the orthophosphate family of salts and minerals.
In water treatment, sodium phosphate sequesters calcium and magnesium ions through chelation, preventing scale formation in boilers and pipework. In food and dairy processing, it functions as a pH buffer and emulsifying salt, stabilising protein structures during heat treatment. Textile and paper manufacturers apply it as a flame retardant by promoting char formation and inhibiting combustion.
Sodium phosphate is available in food-grade (FCC, E339iii) and technical grades as a white crystalline powder. It complies with REACH registration requirements and is supplied in 25 kg bags and bulk quantities. Buyers should confirm grade suitability against Ph.Eur. requirements for pharmaceutical applications.
In water treatment, sodium phosphate sequesters calcium and magnesium ions through chelation, preventing scale formation in boilers and pipework. In food and dairy processing, it functions as a pH buffer and emulsifying salt, stabilising protein structures during heat treatment. Textile and paper manufacturers apply it as a flame retardant by promoting char formation and inhibiting combustion.
Sodium phosphate is available in food-grade (FCC, E339iii) and technical grades as a white crystalline powder. It complies with REACH registration requirements and is supplied in 25 kg bags and bulk quantities. Buyers should confirm grade suitability against Ph.Eur. requirements for pharmaceutical applications.
Physical Properties
| Melting Point | 75 °C (decomp) |
| Density | 2.536 g/cm³ @ Temp: 17.5 °C |
| Appearance | White crystalline powder |
| Color | White |
| Odor | at 100.00?%. odorless |
| Form | Powder |
| Water Solubility | Soluble in water. Insoluble in ethanol and carbon disulfide. |
| Vapor Pressure | 0Pa@20°C |
| pH | 10.95(1 mM solution);11.71(10 mM solution);12.12(100 mM solution) |
Trade & Regulatory
| HS Code | 28352910 |
| UN Number | 3262 |
| ADR Class | 8 |
| Packing Group | III |
| Storage Class | 13 - Non Combustible Solids |
| WGK (Germany) | 1 |
Other Names
Trisodium phosphateNa₃PO₄Na3PO4E339iiiTSPTrometeDri-TriTrisodium orthophosphate
Related Products
Raw Materials
Need a chemical? Get a quote within 24 hours.