Sodium tripolyphosphate
Na₅P₃O₁₀
Na₅P₃O₁₀
SODIUM TRIPOLYPHOSPHATE or STPP is an inorganic compound. It is the sodium salt of the polyphosphate which is the conjugate base of triphosphoric acid. Sodium tripolyphosphate is produced by heating a stoichiometric mixture of disodium phosphate, Na2HPO4 and monosodium phosphate, NaH2PO4 under carefully controlled conditions.
| Chemical name | Pentasodium triphosphate |
| Formula | Na₅P₃O₁₀ |
| Molar mass | 367.8 g/mol |
| CAS / EINECS | 7758-29-4 / 231-838-7 |
| Code | 2835310000 |
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Specification
| Product code
|
1011
|
1014
|
|---|---|---|
| Appearance
|
Granular anhydrous STPP |
White free flowing powder |
| Content of (P2O5)
|
min. 55,5 % |
min. 54,5 % |
| Content of Na5P3O10
|
min. 94 % |
min. 94 % |
| Phase I content
|
–
|
50 – 70 % |
| Hunter colour meter L
|
min. 90 % |
min. 95 % |
| Bulk density
|
900 – 1300 g/l |
1000 – 1200 g/l |
| Particle size composition
|
On sieve 1,000 mm
(1000 microns) max. 15 % |
On sieve 425 microns
(Tyler 35 mesh or equivalent) max. 5,0 % |
|
|
On sieve 0,250 mm
(250 microns) min. 90 % |
On sieve 150 microns
(Tyler 100 mesh or equivalent) min. 75 % |
| Packing
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Packing
| 1011 | 1014 |
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Application
- detergent industry
- ceramics
- leather tanning
- flame retardant