sodium tripolyphosphate(stpp)

STPP  Na5P3O10
MW: 367.86
Na5p3o10 % min  95.0
p2o5 % min  57.0
water insoluble % max 0.05
F % max 0.003
As % max 0.00013
Heavy metals (Pb) % max 0.001
chloride (Cl) % max 0.025
sulphate (so4) % max 0.4
whiteness % min 85
ph(1% aqueous solution) 9.5-10.0
PH value (1% solution) 9.2-10.0
Particle Size through 1.00mm sieve screening test rate is not less than 95%
Item                                                           Index         
                                                            class product, first-class products, qualified product
whiteness:% MIN                                            90.0                     85.0                  80.0
Phosphorus pentoxide (P2O5),%  MIN       57.0                     56.0                  55.0
STPP (NA5P3O10) content,% MIN               96.0                     90.0                  85.0
Water insoluble content,%  MAX                    0.10                    0.10                  0.15
Fe (FE),%  MAX                                                 0.007                   0.015                0.030

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