STPP(Sodium Tripolyphosphate)
1, Sodium Tripolyphosphate (STPP)
2, CAS No.: 7758-29-4
3, HS Code: 28353100
4, Type: STPP 94%min Tech Grade
Properties: White powder, surface density: 0.35-0.9g/cm3, melting point: 622C, free soluble in water, aqueous solution appears acid. It is a kind of inorganic surface active agent. 
Application: 
1, Used as one of the main auxiliaries for synthetic detergent, synergist for soap; Water softener, tanning agent forleather making, auxiliary for dyeing; 
2, As an effective dispersion agent for suspensions of coatings, kaolin, magnesium oxide, calcium carbonate and drilling mud etc.; 
3, As an oil contamination resistance agent in paper production.

Specification:
Re: STPP Tech Grade 94%min

Appearance: White Powder

Na5P3O10: 94.0%Min 

P2 O 5:  57.0%Min  

Water Insoluble Matter:  0.10%Max

Iron(Fe): 0.007%Max 

PH value (1% water solution): 9.2-10.0 

Whiteness :88%Min 

Ignition: loss 1.0 

density (g/cm3): 0.65-0.99

Phase I: 10-30