Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES 28 Inorganic chemicals; organic or inorganic compounds of precious metals , of rare 28 09 Diphosphorus pentaoxide; phosphoric acid; polyphosphoric acids, whether or not c 28 09 10 28 09 10 00 Commodity Code Description 28 09 10 00 00 - Diphosphorus pentaoxide 28 09 20 00 00 - Phosphoric acid and polyphosphoric acids