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STPP is a colourless salt, which exists both in anhydrous form and as the hexahydrate. The anion can be described as the 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.
Sodium Tripolyphosphate / STPP | ||
Indexes | Industrial Grade | Food Grade |
Assay Na5P3O10 % ≥ | 94.0 | 94.0 |
P2O5 % ≥ | 57.0 | 57.0 |
Water Insoluble Matter %≤ | 0.15 | 0.05 |
Iron(Fe) %≤ | 0.01 | 0.01 |
PH value (1% water solution) | 9.2-10.0 | 9.5-10.0 |
Heavy Metal (as Pb) %≤ | -- | 0.001 |
Arsenic (As) %≤ | -- | 0.0003 |
Fluoride (F) %≤ | -- | 0.003 |
Particle Size Through 16 mesh sieve %≥ Through 35 mesh sieve %≥ Trough 100 mesh sieve %≥ | 95.0 90.0 40.0 | 95.0 90.0 40.0 |
Whiteness %≥ | 90.0 | 90.0 |
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