| 280530 | Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed; mercury-Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed |
| 280540 | Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed; mercury-Mercury |
| 280610 | Hydrogen chloride (hydrochloric acid); chlorosulphuric acid-Hydrogen chloride (hydrochloric acid) |
| 280620 | Hydrogen chloride (hydrochloric acid); chlorosulphuric acid-Chlorosulphuric acid |
| 280700 | -Sulphuric acid; oleum |
| 280800 | -Nitric acid; sulphonitric acids |
| 280910 | Diphosphorus pentaoxide; phosphoric acid; polyphosphoric acids, whether or not chemically defined-Diphosphorus pentaoxide |
| 280920 | Diphosphorus pentaoxide; phosphoric acid; polyphosphoric acids, whether or not chemically defined-Phosphoric acid and polyphosphoric acids |
| 281000 | -Oxides of boron; boric acids |
| 281111 | Other inorganic acids and other inorganic oxygen compounds of non-metals-Hydrogen fluoride (hydrofluoric acid) |
| 281119 | Other inorganic acids and other inorganic oxygen compounds of non-metals-Other |
| 281121 | Other inorganic acids and other inorganic oxygen compounds of non-metals-Carbon dioxide |
| 281122 | Other inorganic acids and other inorganic oxygen compounds of non-metals-Silicon dioxide |
| 281129 | Other inorganic acids and other inorganic oxygen compounds of non-metals-Other |
| 281210 | Halides and halide oxides of non-metals-Chlorides and chloride oxides |
