Other Food Additives

Product name: Sodium Tripolyphosphate Molecular Formula: Na5P3O10 Molecular Weight: 367.86 CAS No.: 7758-29-4

Attribute	Details
CAS Number	7758-29-4
Chemical Name	Sodium Tripolyphosphate (STPP)
Formula	Na5P3O10
Molecular Weight	367.86 g/mol
Appearance	White powder or crystalline solid
Density	2.52 g/cm³ (at 20°C)
Melting Point	622°C
Solubility	Highly soluble in water, 20 g/100 mL (at 20°C)
pH (Aqueous Solution)	9.0-10.0 (1% solution at 25°C)
Applications	Used as a water softener, detergent builder, food additive (e.g., moisture retainer, pH adjuster), and in various industrial processes
Stability	Stable under normal conditions, but incompatible with strong oxidants and acids
Storage	Store in a cool, dry place, protected from moisture and heat
Safety	Generally recognized as safe for specific uses; however, avoid contact with eyes and skin; refer to MSDS for detailed safety and handling instructions

Description

Sodium Tripolyphosphate occurs as white, slightly hygroscopic granules, or as a powder. It is anhydrous or contains six molecules of water of hydration. It is freely soluble in water, but insoluble in alcohol. The pH of a 1:100 aqueous solution is about 9.5.

Applications

Sodium tripolyphosphate, also known as pentasodium phosphate, sodium pyrometaphosphate, STPP, pentasodium tripolyphosphate. It’s white powdery crystal with good fluidity, relative molecular weight 367.86, melting point 622°C, easily soluble in water, and its aqueous solution is alkaline.It is commonly used in food as moisture retention agent, quality improver, pH regulator, and metal chelating agent. The aqueous solution of sodium tripolyphosphate is weakly alkaline (the PH value of a 1% aqueous solution is about 9.7). It forms a suspension (similar to an emulsion) in water in the pH range of 4.3-14, that is, dispersion. Sodium tripolyphosphate can also make the liquid and solid particles better dissolve in the liquid (such as water) medium, making the solution completely transparent, like a real solution, which is the solubilization effect. Because of the above unique properties of sodium tripolyphosphate, it becomes an important ideal raw material in washing powder.

Specification

Appearance White crystals or crystalline powder Assay of Na5P3O10 ≥ 85.0% Arsenic ≤3ppm Fluoride ≤0.005% Lead ≤2ppm In-soluble substances ≤0.1% Packing 25kg/ bag or as per requirement. Storage Store in a cool dry place.

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