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Sodium tripolyphosphate is a solid, inorganic compound present in the form of slightly hygroscopic granules or powder. The stable form of STPP is the hexahydrated salt.

Impurities of sodium tripolyphosphate may include sodium pyrophosphate, sodium orthophosphate and sodium metaphosphate. Typical analysis give :

STPP 95 %

Pyro + Ortho + Metaphosphate 2 %

The impurity profile depends of the production process and the composition of the raw materials.