Food & beverage
Moisture retention in meat and seafood.
Ingredients / Phosphates / Sodium Tripolyphosphate, STPP
Phosphates
Sodium Tripolyphosphate, STPP (E 451(i))
Sodium tripolyphosphate (STPP) for U.S. manufacturers, from vetted producers. FCC / USP grade on request. Download the sample spec sheet, then send us your grade and quantity.
TRACED · CERTIFIED · RELIABLE · TRANSPARENT · TESTED
Key facts
| CAS No. | 7758-29-4 |
|---|---|
| E-number (EU) | E 451(i) |
| Synonyms | Pentasodium tripolyphosphate, Sodium tripolyphosphate |
| Chemical formula | Na5O10P3 · nH2O (n = 0 or 6) |
| Molecular weight | 367,86 |
| Description | White, slightly hygroscopic granules or powder |
| Solubility | Freely soluble in water. Insoluble in ethanol |
| Grades | EU Reg. 231/2012 (E 451(i)) sample spec · FCC / USP available on request for U.S. food/pharma use |
| Origin | Confirmed in every offer; stated per lot on the COA |
| Storage, shelf life, packaging | Per the producer's specification, on request |
What sodium tripolyphosphate (STPP) is
Chemical name: Pentasodium triphosphate. Formula Na5O10P3 · nH2O (n = 0 or 6), molecular weight 367,86. White, slightly hygroscopic granules or powder. Freely soluble in water. Insoluble in ethanol. (Source: EU Regulation 231/2012, E 451(i).)
Applications by industry
Sample specification
Values from EU Regulation 231/2012 (E 451(i)), consolidated text of 18.08.2026. Actual values depend on the producer; the producer's specification and the COA for your lot are available on request.
| Assay | Content not less than 85,0 % (anhydrous) or 65,0 % (hexahydrate) P2O5 content not less than 56 % and not more than 59 % (anhydrous) or not less than 43 % and not more than 45 % (hexahydrate) |
|---|---|
| Loss on drying | Anhydrous: Not more than 0,7 % (105 °C, 1 hour) Hexahydrate: Not more than 23,5 % (60 °C, 1 hour, then 105 °C, 4 hours) |
| Water insoluble matter | Not more than 0,1 % |
| Higher polyphosphates | Not more than 1 % |
| Fluoride | Not more than 10 mg/kg (expressed as fluorine) |
| Arsenic | Not more than 1 mg/kg |
| Cadmium | Not more than 1 mg/kg |
| Lead | Not more than 1 mg/kg |
| Mercury | Not more than 1 mg/kg |
Download the full spec sheet (PDF)
Documents and sourcing
Droplet promise. Origin confirmed in every offer. Sample lot record on request, from the producer. SDS, allergen and other statements on request. We work with vetted producers and give you access to U.S.- and EU-stocked material through our partner network.
Data sheet, SDS and COA on request. Every delivery ships with a COA linked to the delivered lot.
Questions buyers ask
What is sodium tripolyphosphate (STPP) used for?
Typical uses by industry. Food & beverage: Moisture retention in meat and seafood. Suitability for your product and market is confirmed with the producer's specification.
Which grades can McBoeck supply?
Food grade to EU Regulation 231/2012 (E 451(i)). FCC / USP grade is available on request for U.S. food and pharma use. Particle size and other grade details follow the producer's specification, on request.
Which documents come with sodium tripolyphosphate (STPP)?
Every delivery ships with a COA linked to the delivered lot. Origin confirmed in every offer. Sample lot record on request, from the producer. SDS, allergen and other statements on request.
What does the sample spec sheet show?
Limits for assay, loss on drying, water insoluble matter, higher polyphosphates, fluoride, arsenic, cadmium, lead and mercury, taken from EU Regulation 231/2012. Actual values depend on the producer; the producer's specification and the lot COA are available on request.
How do I get a quote?
Send us the grade, quantity and delivery location through the quote form or at [email protected]. We work with vetted producers and give you access to U.S.- and EU-stocked material through our partner network.
Related phosphates
Dicalcium PhosphateDipotassium Hydrogen Phosphate (DKP)Disodium Phosphate (DSP)Monocalcium PhosphateAll phosphates
Need sodium tripolyphosphate (STPP)?
Send us the grade, quantity and delivery location. Email [email protected] or call +1 (713) 766-6811.