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Sodium Tripolyphosphate

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Molecular Formula:Na5P3O10

Molecular Weight:368

CAS No:7758-29-4

Property:As a chained condensation compound of phosphate soluble in water, it has two existing forms: Na5P3O10(Anhydrous) and Na5P3O10·6H2O (Crystal). The specific gravity of Na5P3O10·6H2O is 2.12, that of Na5P3O10 is 0.5-0.6, melting point for both is 622℃. Anhydrous Na5P3O10 is capable of absorbing humidity with its aqueous solution being alkalinity and will be hydrolyzed to ortho-phosphates; It can have emulsification, suspension and dispersion of mud and oil; it has strong buffering effects with PH value between 4.3-14.


Grade Excellent
Sodium Tripolyphosphate (Na5P3O10)
94% Min
Phosphorus Pentaoxide (P2O5)
57.0% Min
Insoluble Matter In Water
0.10% Max
Ferrum (Fe)
0.015% Max
PH Value (1% solution)
9.2 - 10.0
80% Min
Apparent density g/cm2
0.35 - 0.99
I type content
Particulate Size (Remainder on 1mm testing screen)
5.0% Max



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