Sodium Tripolyphosphate(STPP)

Sodium Tripolyphosphate (STPP) is a water-soluble inorganic phosphate supplied as white powder or granules. It is used as a detergent builder, sequestrant and dispersant. Food applications require a food-grade product that meets the relevant purity specifications and permitted conditions of use.

Brand:
aozun
Synonym:
Sodium Tripolyphosphate(STPP)
Appearance:
White crystalline powder
CAS No.:
7758-29-4
Molecular Formula:
Na5P3O10
Molecular Weight:
367
EINECS:
231-838-7
Solubility:
soluble in water

Availability:



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Product Description

Product Description

Key Specifications

Item	Specification
CAS Number	7758-29-4
Chemical Formula	Na₅P₃O₁₀
Molecular Weight	367.86 g/mol
Appearance	White powder or granules
STPP Content, Dry Basis	≥94.0%
P₂O₅ Content	56.0–58.0%
pH, 1% Solution	9.2–10.0
Loss on Drying, 105°C	≤2.0%
Water Solubility	Soluble

Specifications depend on the selected grade. Please request the current product specification and batch Certificate of Analysis (COA).

Applications

Detergents and Cleaning: Used as a phosphate builder to bind calcium and magnesium ions, support surfactant performance and help disperse soil in suitable cleaning formulations.

Food Processing — Food Grade Only: Used in permitted meat, poultry and seafood applications to support moisture retention and texture. The supplied grade, dosage and intended use must meet destination-market requirements.

Ceramics: Used as a deflocculant in suitable ceramic slurries to help control viscosity and improve flow. Performance depends on the raw materials and formulation.

Water Treatment: Used in selected formulations for metal-ion sequestration and scale control. Product selection and dosage depend on water chemistry and operating conditions.

Storage and Handling

Store in tightly closed packaging in a dry, well-ventilated area. Protect from moisture, contamination and packaging damage. Follow the storage conditions and retest or expiry date stated in the supplier's quality documents.

Avoid generating or inhaling dust. Use suitable gloves and eye protection, and follow the current Safety Data Sheet (SDS) for handling and spill procedures.

Frequently Asked Questions (FAQs)

What is Sodium Tripolyphosphate used for?

Sodium Tripolyphosphate (CAS 7758-29-4) is widely applied as a builder in detergents for water softening and soil removal, a sequestrant in foods to retain moisture and improve texture, and a dispersant in industrial processes like ceramics and water treatment.

Can industrial-grade STPP be used in food processing?

Industrial-grade STPP should not be substituted for food-grade material. Food applications require a product meeting the applicable purity specifications and permitted conditions of use.

What is the difference between anhydrous and hexahydrate forms?

The anhydrous form (CAS 7758-29-4) is denser and more stable for dry applications, while the hexahydrate (CAS 15091-98-2) offers higher solubility for liquid formulations. Both share core functionalities but differ in handling.

How should Sodium Tripolyphosphate be stored?

Store in a cool, dry, ventilated area in sealed containers to avoid moisture absorption and caking. Keep away from acids and oxidizers; it remains stable for 24 months under ideal conditions.

What impurity information should buyers request?

Request the specification and batch COA for the selected grade, including relevant limits for lead, arsenic, fluoride and other controlled impurities. Requirements depend on the application and destination market.

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