Sodium triphosphate (STP, sometimes STPP or sodium tripolyphosphate or TPP, is an inorganic compound with formula Na₅P₃O₁₀. It is the sodium salt of the polyphosphate penta-anion, which is the conjugate base of triphosphoric acid. It is produced on a large scale as a component of many domestic and industrial products, especially detergents. Environmental problems associated with eutrophication are attributed to its widespread use.

CAS No. : 7758-29-4
Other names: STPP, Triphophate
Packing: 25 kgs or 50 kgs packed in inside plastic bags with outside woven bags.
Molecular formula: Na5P3O10
Standard: FCC (IV), GB 25566-2010, QB1034-91
Min. order: 10metric tons
Delivery time: 10days after get deposit

 

The majority of STPP is consumed as a component of commercial detergents. It serves as a "builder," industrial jargon for a water softener. In hard water (water that contains high concentrations of Mg²⁺ and Ca²⁺), detergents are deactivated. Being a highly charged chelating agent, TPP^5- binds to dications tightly and prevents them from interfering with the sulfonate detergent.

STPP is a preservative for seafood, meats, poultry, and animal feeds. It is common in food production as E number E451. In foods, STPP is used to retain moisture. Many governments regulate the quantities allowed in foods, as it can substantially increase the sale weight of seafood in particular. The United States Food and Drug Administration lists STPP as "generally recognized as safe."

Other uses (hundreds of thousands of tons/year) include "ceramics, leather tanning (as masking Agent and Synthetic Tanning Agent-SYNTAN), anticaking, setting retarders, flame retardants, paper, anticorrosion pigments, textiles, rubber manufacture, fermentation, antifreeze."

 
Specific In formations: