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Sodium tripolyphosphate(STPP)
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 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.
Main use: Mainly used as additive in synthesizing detergent. Used as soap synergist, water softener, pretanning, dyes auxiliary and oil proof etc..
Packaging and transportation: 25kg-50kg woven bag lined with plastic, stored in dry and draughty place.
Technical index:
|
No. |
Item |
Top quality |
First quality |
|
1 |
Main content(base on Na5P3O10) % ≥ |
94 |
90 |
|
2 |
Phosphorus pentoxide % ≥ |
57 |
56.5 |
|
3 |
Insoluble substance in water % ≤ |
0.04 |
0.08 |
|
4 |
Iron content % ≤ |
0.006 |
0.007 |
|
5 |
Whiteness % ≥ |
92 |
90 |
|
6 |
Granularity 1mm test sieve % |
5 |
5 |
|
7 |
Drying loss % ≤ |
0.5 |
0.5 |
|
8 |
PH value(1% aqueous solution) |
9.2—10.0 |
9.2—10.0 |
|
9 |
Content of type I |
|
|
|
10 |
Apparent density g/cm3 |
|
|
|
