PENTASODIUM TRIPHOSPHATE- ▸ Detergent builder: Softens water and boosts cleaning in fabric- and dish-washing formulations.
- ▸ Sequestrant: Chelates calcium and magnesium ions to control water hardness and scale.
- ▸ Dispersing agent: Peptizes and disperses solids in ceramics, pigments, and drilling fluids.
- ▸ Food texturizer: Functions as a phosphate texturizing additive in food processing.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Sodium tripolyphosphate (pentasodium triphosphate, CAS 7758-29-4) is an inorganic condensed phosphate. Industry references record its use in water softening, heavy-duty fabric and automatic-dishwashing detergents, drilling-fluid treatment, and as a sequestering, dispersing, and anti-caking agent; it is also recognized as a food texturizer.
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 231-838-7
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Solutions Using This Product
Process-solution guides on this site that specify this chemistry:
- Boiler Blowdown & pH/Alkalinity Control (Water Treatment)
- Water Retention & Yield in Meat, Poultry & Seafood (Phosphates) (Food & Beverage)
- Alkaline Cleaning & Degreasing Chemicals (Industrial Manufacturing)
Frequently Asked Questions
What is sodium tripolyphosphate (STPP) used for?
Sodium tripolyphosphate (pentasodium triphosphate, CAS 7758-29-4) is an inorganic condensed phosphate used as a detergent builder that softens water in fabric- and dishwashing formulations, as a sequestrant that chelates calcium and magnesium to control hardness and scale, as a dispersant in ceramics, pigments, and drilling fluids, and as a phosphate texturizer in food processing.
Is STPP soluble in water?
Yes. STPP is water-soluble and forms an alkaline solution; in solution it sequesters calcium and magnesium ions, which is the basis of its water-softening and anti-scale function. See the SDS for handling data.
What is the chemical formula and CAS for STPP?
Sodium tripolyphosphate has the formula Na5P3O10 and CAS 7758-29-4. It is supplied in technical and food-grade qualities; specify the grade required on your order and each lot ships with a Certificate of Analysis.
What HS code applies to sodium tripolyphosphate?
STPP is classified under HS heading 2835.31 (Sodium triphosphate / sodium tripolyphosphate). Confirm the destination tariff line with your customs broker before export.
What is the price of bulk sodium tripolyphosphate?
Bulk STPP pricing depends on grade (technical vs. food), order volume, and packaging (bags, supersacks, or bulk). Submit a bulk RFQ with quantity and delivery point and we will return a current quote with CoA and SDS.
What is the REACH and TSCA regulatory status of Sodium Tripolyphosphate (STPP)?
Sodium Tripolyphosphate (STPP) (CAS 7758-29-4) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 231-838-7).