Sodium Tripolyphosphate (STPP)

Sodium tripolyphosphate (STPP) is a widely used sodium-based compound recognized for its ability to soften water, disperse solids, and enhance cleaning efficiency. It is most commonly applied in detergents and cleaning formulations, where it binds calcium and magnesium ions to prevent scale formation and improve surfactant performance. In water treatment, STPP supports both municipal and industrial systems by controlling hardness and stabilizing water chemistry.

Beyond cleaning and water treatment, sodium tripolyphosphate is employed in food processing as a preservative and texturizer, helping retain moisture and improve the quality of seafood, meats, and poultry. It also plays a role in ceramics, textile processing, and specialty chemical applications. With its balance of cost-effectiveness, functionality, and versatility, STPP remains a critical raw material across industries ranging from consumer goods and food production to construction, textiles, and chemical manufacturing.

Synonyms: Sodium tripolyphosphate, Na₅P₃O₁₀, STPP

Characteristics:

IUPAC Name: Trisodium phosphate

CAS Number: 7758-29-4

UN Number: 3262

Recommended Use / Industries:

• Detergents and cleaners
• Water treatment
• Food additives (emulsifier, preservative)
• Ceramics and textiles