… acid; polyphosphoric acids, whether or not chemically defined. …
Explanatory notes
… acid; polyphosphoric acids, whether or not chemically defined. 2809.10 ‑ Diphosphorus pentaoxide 2809.20 ‑ … phosphorus pentoxide, phosphoric anhydride) (P 2 O 5 ) is obtained by combustion, in dry air, of phosphorus extracted … acid (commercial metaphosphoric acid) is a non‑chemically defined mixture of polyphosphoric acids (mainly linear), …