Product Updates
2025-02-10
Sodium Tripolyphosphate: Applications and Quality Standards Explained
Sodium tripolyphosphate (STPP, Na₅P₃O₁₀) is one of the most widely consumed inorganic phosphates globally, with annual demand exceeding 2 million metric tonnes. Its chelating, dispersing and buffering properties make it indispensable across multiple industries.
Primary Applications
- Detergents & cleaning agents: STPP sequesters calcium and magnesium ions, improving surfactant efficiency and reducing scale formation.
- Ceramics: Used as a deflocculant in ceramic slips to reduce viscosity and improve casting performance.
- Food processing: Food-grade STPP (E451) is approved as a sequestrant, texturizer and moisture-retention agent in seafood, meat and dairy products.
- Water treatment: Applied in boiler and cooling water systems to control scale and corrosion.
Key Quality Parameters
| Parameter | Industrial Grade | Food Grade |
|---|---|---|
| STPP content | ≥ 94% | ≥ 95% |
| P₂O₅ content | 57–58% | 57–58% |
| Heavy metals (as Pb) | ≤ 10 ppm | ≤ 2 ppm |
| Arsenic | ≤ 3 ppm | ≤ 1 ppm |
| pH (1% solution) | 9.5–10.5 | 9.5–10.0 |
When sourcing, buyers should request a Certificate of Analysis (COA), MSDS and, for food-grade material, relevant food safety certification such as FSSC 22000 or BRC.