Sodium triphosphate (STP, 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
Sodium tripolyphosphate is produced by heating a stoichiometric mixture of disodium phosphate, Na2HPO4, and monosodium phosphate,
NaH2PO4, under carefully controlled conditions.
2 Na2HPO4 plus NaH2PO4 Na5P3O10 plus 2 H2O
In this way, approximately 2 million tons are produced annually.
pentanionic chain [O3POP(O)2OPO3]5-. Many related di-, tri-, and polyphosphates are known including the cyclic triphosphate
P3O93-. It binds strongly to metal cations as both a bidentate and tridentate chelating agent.
(water that contains high concentrations of Mg2 plus and Ca2 plus ), detergents are
Deactivated. Being a highly chargedchelating agent, TPP5- binds to dications
In food production as E number E451. In foods, STPP is used as an emulsifier and
Tanning(as masking agent and synthetic tanning agent - SYNTAN), anticaking,
Packaging Detail: 25Kg double inner plastic and outer knitting bag, customer's demand
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Sodium Tripolyphosphate / STPPIndexesIndustrial GradeFood GradeAssay Na5P3O10 percent Greater than or equal to 94.094.0P2O5 percent Greater than or equal to 57.057.0Water Insoluble Matter percent Less than or equal to
{{0}}.150.05Iron(Fe) percent Less than or equal to 0.010.01PH value (1 percent water solution)9.2-10.09.5-10.0Heavy Metal (as Pb) percent Less than or equal to --0.001Arsenic (As) percent Less than or equal to --0.0003
Fluoride (F) percent Less than or equal to --0.003Particle Size
Through 16 mesh sieve percent Greater than or equal to
Through 35 mesh sieve percent Greater than or equal to
Trough 100 mesh sieve percent Greater than or equal to
95.0
90.0
40.0
95.0
90.0
40.0Whiteness percent Greater than or equal to 90.090.0
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