HS Heading 2904 — Duty Rates and HS Codes
6-Digit HS Codes
290410 Derivatives containing only sulpho groups, their salts and ethyl esters 290420 Derivatives containing only nitro or only nitroso groups 290431 Perfluorooctane sulphonic acid, its salts and perfluorooctane sulphonyl fluoride 290432 Ammonium perfluorooctane sulphonate 290433 Lithium perfluorooctane sulphonate 290434 Potassium perfluorooctane sulphonate 290435 Other salts of perfluorooctane sulphonic acid 290436 Perfluorooctane sulphonyl fluoride 290491 Other 290499 Other