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Sodium Tripolyphosphate(STPP)  

Synonym: Pentasodium Triphosphate; Pentasodium Tripolyphosphate; Sodium Phosphate Tripoly; Sodium Triphosphate; Sodium Tripolyphosphate; Stpp; Triphosphoric Acid, Pentasodium Salt

Formular: NA5O10P3   M. W.: 367.86413 CAS NO.: 7758-29-4   H.S. No.: 2835.3100  

Description: white powder; melting point 622°C; easily soluble in water; it has got salient chelating capacity to ions of ca and mg etc. And can soften hard water to make suspension solution become into clear solution; it has got weak alkalinity but no corrosiveness. It is a surfactant, and has got outstanding emulsification to lubricants and fat. It has different bulk density, i.e. Low density 0.35-0.5g/cm3, medium density 0.51-0.65g/cm3 and high density 0.66-0.9g/cm3. This product has two crystalline forms, namely type i (high temperature type) and type ii (low temperature type). The chemical properties of the two types are the same, and the difference between them lies in the thermostability, hygroscopicity, and solubility and hydration heat when dissolving.  

Grade: Tech Grade  

Specifications:  

NA5P3O10	94% min
P2O5	57.0% min
Water insoluble matter	0.15% max
Iron (Fe)	0.01% max
Ph value (1% water solution)	9.2-10.0
Particle size through 16 mesh sieve through 35 mesh sieve trough 100 mesh sieve	95% 90% 40%
Whiteness	90 max

Uses: used as one of the main auxiliaries for synthetic detergent, synergist for soap; water softener, tanning agent for leather making, auxiliary for dyeing; as an effective dispersion agent for suspension solutions of coatings, kaolin, magnesium oxide, calcium carbonate and drilling mud etc.; as an oil contamination resistance agent in paper production.  

 Packing:    in 25kg net plastic woven bag; 22mt/1x20FCL

sodium tripolyphosphate (stpp)