... 29-4 EINECS NO.: 237-004-9 Sodium Tripolyphosphate (STPP)Synonyms: triphosphoric acid pentasodium salt, pentasodium triphosphate, tripolyphosphate ... pentasodium, sodium triphosphate, STPP, armofos, empiphos stp-D, freez-gard FP 19, ... solution)9.5-10.09.72Contents ( P2O5 ) %≥56.057.2Fluoride %≤0.005 <0.0007Water insoluble substance %≤0.05 ...