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Sodium Tripolyphosphate (STPP)
 
Alias: sodium tripolyphosphate polygon(sometimes STP or sodium triphosphate or TPP)
Molecular formula: Na5P3O10
MW: 367.86 
CAS No.:7758-29-4
 
Character: Whiteness powder,Melting point 622C. It is soluble in water. It is a good Chelating agent with metal ions such as Fe, Ca, Mg. Alkalescency, non-corrosiveness it is inorganic surfactant.
Uses:It is used in various applications such as a preservative for seafood, meats, poultry and pet foods. It is also used in toothpaste and as a builder in soaps and detergents, improving their cleansing ability.STPP is a solid inorganic compound used in a large variety of household cleaning products, mainly as a builder, but also in human foodstuffs, animal feeds, industrial cleaning processes and ceramics manufacture. STPP is widely used in regular and compact laundry detergents and automatic dishwashing detergents (in powder, liquid, gel and/or tablet form), toilet cleaners, surface cleaners, and coffee urn cleaners. It also provides a number of chemical functions including: sequestration of "water hardness", enabling surfactants to function effectively; PH buffering; dirt emulsification and prevention of deposition; hydrolysis of grease; and issolving-dispersing dirt particles.
 
Quality standard (reference standard)
Specification Index
Technical grade Food grade
Main content(Na5P3O10%min 94.0 95.0
(P2O5%min 57.0 57.0
Fe %max 0.01 0.01
PH(1% solution) 9.2-10.0 9.5-10.0
Whiteness 90 90
Heaven metal(Pb)%max --- 0.001
As%max --- 0.0003
F %max --- 0.003
Water insoluble %max 0.15 0.05
Size 16 mesh %min 95 95
35 mesh %min 90 90
100 mesh %min 40 40
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