... 5 g/100 ml (25 ºC) Sodium tripolyphosphate (STPP, sometimes STP or sodium triphosphate or TPP), with ... in soaps and detergents, improving their cleansing ability. Specifications: STPP 96%MinIndustry GradeFood GradePurity (Na5P3O10)% ≥9494P2O5 %≥57.0057Iron ... is the main additive in syntheticdetergents, soap synergistic agent,industrial water softener, leather pretanning agents,dyeing auxiliaries, oil ...