... with perfect packing; 3.Adhere the equality and mutual benefit. Sodium Tripolyphosphate (STPP) specification:Synonyms: triphosphoric acid pentasodium salt, pentasodium triphosphate, tripolyphosphate ... pentasodium, sodium triphosphate, STPP, armofos, empiphos stp-D, freez-gard FP 19, polygon, rhodiaphos ...