... -4 EINECS NO.: 237-004-9 Sodium Tripolyphosphate (STPP)Synonyms: triphosphoric acid pentasodium salt, pentasodium triphosphate, tripolyphosphate pentasodium, sodium triphosphate, STPP, armofos, empiphos stp ... Metal≤10PPM<8PPMConclusionIn compliance with the standard of GB25566-2010 Sodium Tripolyphosphate(STPP)