Sodium Tetra Poly Phosphate

Water Conditioning: Used to soften industrial water and prevent scale formation in pipelines and heat exchangers by sequestering calcium and magnesium.
Cleaning Formulations: Acts as a builder in heavy-duty industrial cleaners to improve soil suspension and detergent efficiency in hard water.
Ceramics and Clay: Functions as a dispersing agent to reduce the viscosity of clay slips and ceramic glazes for better processing.

STPP (not to be confused with Tripoly), Tetrapoly, Hexasodium Tetraphosphate.

CAS: 7727-67-5
EC: 231-778-1
Sectors: Water & Wastewater Treatment, Home Care & Industrial Cleaning

Sodium Tetra Poly Phosphate (CAS 7727-67-5) is a condensed inorganic phosphate salt supplied as a Technical Grade white powder or granules, with a tetraphosphate chain that gives it high sequestration capacity for divalent metal ions, and it is used as a deflocculant, water softener and detergent builder. It belongs to the family of condensed phosphates, offering a high sequestration capacity for divalent metal ions in aqueous systems.

This chemical is particularly effective as a deflocculant and water softener in industrial applications where high mineral content is present. Its molecular chain length provides a balanced performance between the shorter pyrophosphates and longer hexametaphosphates, ensuring stable pH control.

In the detergent and cleaning sector, it serves as a high-performance builder, preventing the redeposition of soil onto surfaces and enhancing the efficiency of surfactants. Its ability to maintain mineral solubility makes it a preferred choice for specialized boiler water treatment and ceramic production.

Typical Properties

Molecular formula	H₆O₁₃P₄.xNa
Molecular weight	469.83 g/mol
Grades available	Technical Grade

Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.

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