... min 85%, Phase I 5-40, Fe max 70PPM Sodium Tripolyphosphate (STPP)Synonyms: triphosphoric acid pentasodium salt, pentasodium triphosphate ... , tripolyphosphate pentasodium, sodium triphosphate, STPP, armofos, empiphos stp-D, freez-gard FP ... MAX0.0004% MAXPH(1% WATER SOLUTION)9.2-10.09.5WHITENESS9092IGNITION LOSS1.01.0DENSITY(G/CM3)0.35- ...