| 2904.10.00 | - Derivatives containing only sulpho groups, their salts and ethyl | |
| 2904.20.00 | - Derivatives containing only nitro or only nitroso groups | |
| 2904.31.00 | -- Perfluorooctane sulphonic acid | |
| 2904.32.00 | -- Ammonium perfluorooctane sulphonate | |
| 2904.33.00 | -- Lithium perfluorooctane sulphonate | |
| 2904.34.00 | -- Potassium perfluorooctane sulphonate | |
| 2904.35.00 | -- Other salts of perfluorooctane sulphonic acid | |
| 2904.36.00 | -- Perfluorooctane sulphonyl fluoride | |
| 2904.91.00 | --Trichloronitromethane (chloropicrin) | |
| 2904.99.00 | -- Other |