Sodium tripolyphosphate(STPP)
[Chemical formula] Na5P3O10
[Molecular weight] 367.86
[Voluntary standards] GB9983-88
[Properties] White powder, surface density: 0.35-0.9g/cm3, melting point:622℃, free soluble in water, aqueous solution appears acid. It is a kind of inorganic surface active agent.
[Packaging and transportation] 25kg-50kg woven bag lined with plastic, stored in dry and draughty place.

1 Main content(base on Na5P3O10) % ≥ 94
2 Phosphorus pentoxide% ≥ 57
3 Insoluble substance in water% ≤ 0.04
4 Iron content% ≤ 0.006
5 Whiteness% ≥ 92
Granularity 1mm test sieve% 5
7 Drying loss% ≤ 0.5
8 PH value(1% aqueous solution) 9.2--10.0