Sodium Tripolyphosphate (STPP)
Chemical formula:
Na5P3O10
Property:
White particle or powder, appearant density 0.35-0.90g/cm3, melting point 622ºC. Easily soluble in water, aqueous solution is alkali. Hydrolyze to orthophosphate in water, complexing with calcium, magnesium, iron and other metal ions and generate soluble complex. As inorganic surfactant, it has certain properties of organic surfactants.
TECHNICAL INDEX (
GB/T 9983-2004)
Item | Tech Grade | Food Grade |
STPP (Na5P3O10), %≥ | 94.0 | 94.0 |
(P2O5), %≥ | 57.0 | 57.0 |
Water insoluble, %≤ | 0.10 | 0.10 |
Iron (Fe), %≤ | 0.007 | 0.007 |
Whiteness, %≥ | 90.0 | 90.0 |
Heavy Metal (as Pb), %≥ | - | 0.001 |
(As), %≥ | - | 0.0003 |
Fluoride (F), %≥ | - | 0.003 |
PH value(10g/L Solution) | 9.2~10.0 | 9.2~10.0 |
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