Sodium Tripolyphosphate
Sodium Tripolyphosphate (STPP, CAS 7758-29-4, E451(i)), min. 94% with min. 57% P2O5, supplied wholesale by Zyntex. For industrial cleaners, ceramics, food moisture retention and water treatment. CoA and SDS with every lot.
Description
Sodium Tripolyphosphate Product Overview
Sodium tripolyphosphate (Na5P3O10) is a white powder or fine granule that dissolves well in water. It binds calcium and magnesium ions, which softens water, and it disperses solid particles in liquids. Food producers know it as E451(i).
For decades, STPP was the main builder in laundry and dishwasher detergents. The EU has since restricted phosphates in consumer laundry and dishwasher detergents, but STPP remains common in industrial and institutional cleaners and in many markets outside the EU. Ceramic tile and porcelain producers also use it as a deflocculant, because it lowers the viscosity of clay slips.
In food processing, STPP helps meat, poultry and seafood retain moisture and keeps texture consistent. Other uses include water treatment, leather tanning and paper. For related phosphate products, see Disodium Phosphate Food Grade and Phosphoric acid.
Key Applications of Sodium Tripolyphosphate
Main application areas:
🧺 Detergents
Builder and water softener in industrial and institutional cleaners.
🏺 Ceramics
Deflocculant for clay slips in tile and porcelain production.
🍤 Food Processing
Moisture retention in meat, poultry and seafood (E451).
💧 Water Treatment
Sequestering agent against scale and metal ions.
Sodium Tripolyphosphate Technical Specifications
| Parameter | Standard Value |
|---|---|
| Product Name | Sodium Tripolyphosphate (STPP) |
| CAS Number | 7758-29-4 |
| EC Number | 231-838-7 |
| E Number | E451(i) |
| Molecular Formula / Weight | Na5P3O10 / 367.86 g/mol |
| Assay (as Na5P3O10) | 94.0% Minimum |
| P2O5 Content | 57.0% Minimum |
| Physical State | White Powder or Fine Granules |
| Documents | CoA and SDS with every lot |
⚠️ Safety & Handling: Not classified as hazardous under GHS, but dust may irritate the eyes and respiratory tract. Wear eye protection and dust protection when handling. Store in tightly closed bags in a dry place to prevent caking. Always consult the Safety Data Sheet (SDS) for full classification and handling instructions.
Frequently Asked Questions
Can STPP be used in household detergents in the EU?
The EU restricts phosphorus in consumer laundry and automatic dishwasher detergents. STPP is still used in industrial and institutional cleaners and in other markets.
Do you supply food-grade STPP?
Yes, food-grade STPP meeting E451(i) specifications can be supplied with the relevant documentation. Please mention the grade when requesting a quote.
How can I get a price and documents?
Prices depend on quantity, packaging and destination. Contact us with your required volume to receive a quotation together with the CoA and SDS.
