Stpp na5p3o10 Mw: 367.86 Low-density :0.35-0.5g/cm3, medium-density :0.51-0.65g/cm3, high-density :0.66-0.9g/cm3 Appearance: white granular or powder Sodium tripolyphosphate in line with industry requirements in the following table (gb9983-2004) Item standard 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% 25kg/bag