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Sodium Tripolyphosphate (STPP) CAS 7758-29-4 powder granular

Sodium Tripolyphosphate (STPP) is a widely used inorganic polyphosphate compound, widely applied in food, industrial cleaning, water treatment and other fields. It is recognized as a versatile additive with stable chemical properties and excellent performance, favored by global procurement.

Aliases

Sodium Tripolyphosphate (STPP) is also known by various industry aliases, including Tripolyphosphoric Acid Trisodium Salt, STPP, Sodium Triphosphate, and Trisodium Tripolyphosphate.

Appearance & Physical Properties

Sodium Tripolyphosphate (STPP) is mainly available in two common forms: white crystalline powder and white granular, both of which are odorless and tasteless. It is highly soluble in water, slightly soluble in dilute organic acids, and insoluble in ethanol and other organic solvents. Its aqueous solution is alkaline, with good chelating, dispersing and emulsifying properties.

Physical & Chemical Properties

Industrial Grade Specifications

Main Applications

Food Industry: As a food additive (E451(i)), Sodium Tripolyphosphate (STPP) is used as a water-retaining agent, emulsifier, and texture improver in meat, seafood, dairy products and baked goods, helping to maintain product tenderness and extend shelf life.

Industrial Cleaning: It is an excellent chelating agent and detergent auxiliary, widely used in laundry detergents, dishwashing detergents and industrial metal cleaning agents, effectively removing stubborn stains and preventing scale formation.

Water Treatment: Used as a water softener and scale inhibitor in industrial circulating water systems and boiler water treatment, chelating calcium, magnesium and other metal ions to avoid scale buildup and improve water quality.

Textile Industry: Serves as a dyeing auxiliary and dispersant in textile printing and dyeing, improving the uniformity of dyeing and enhancing the color fastness of fabrics.

Other Fields: Applied in ceramic production as a dispersant to improve the fluidity of ceramic slurries; used in oil drilling as a mud additive to adjust the viscosity of drilling mud.

Safety Information

Sodium Tripolyphosphate (STPP) has completed REACH registration, complying with EU chemical regulations and meeting international import and export standards. A MSDS download is available to provide detailed information on safety, handling, storage and emergency measures, ensuring safe use and transportation.

FAQ

What is the difference between powder and granular forms of Sodium Tripolyphosphate?

The powder form has a finer particle size, suitable for scenarios requiring rapid dissolution, such as food processing and small-scale cleaning; the granular form has better fluidity, not easy to agglomerate, and is more suitable for large-scale industrial production and automatic feeding systems.

Does Sodium Tripolyphosphate meet food safety standards for export?

Yes, food-grade Sodium Tripolyphosphate complies with international food safety standards (such as FDA, EU E451(i)), with strict control over heavy metals and impurities, and can be used for export food processing after passing relevant inspections.

What is the shelf life of Sodium Tripolyphosphate?

When stored in a cool, dry and well-ventilated environment, tightly sealed in original packaging, the shelf life of Sodium Tripolyphosphate is 24 months. Avoid moisture absorption and contact with acidic substances during storage to prevent product degradation.

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