HS CodesVI · Products of the chemical or allied industries28 · Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes2809280920280920Chapter 28Copy pagePhosphoric acid and polyphosphoric acidsDescriptionDiphosphorus pentaoxide; phosphoric acid; polyphosphoric acids, whether or not chemically defined : Phosphoric acid and polyphosphoric acidsWas this page helpful?YesNoPrevious280910Diphosphorus pentaoxideNextOxides of boron; boric acids281000