| 2800 | INORGANIC CHEMICALS; ORGANIC OR INORGANIC COMPOUNDS OF PRECIOUS METALS, OF RARE-EARTH METALS, OF RADIOACTIVE ELEMENTS OR OF ISOTOPES | |
| 2801 | Fluorine, chlorine, bromine and iodine |  Ontological structure of 2801 |
| 2802 | Sulphur, sublimed or precipitated; colloidal sulphur | Ontological structure of 2802 |
| 2803 | Carbon (carbon blacks and other forms of carbon not elsewhere specified or included) | Ontological structure of 2803 |
| 2804 | Hydrogen, rare gases and other non-metals | Ontological structure of 2804 |
| 2805 | Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed; mercury | Ontological structure of 2805 |
| 2806 | Hydrogen chloride (hydrochloric acid); chlorosulphuric acid | Ontological structure of 2806 |
| 2807 | Sulphuric acid; oleum | Ontological structure of 2807 |
| 2808 | Nitric acid; sulphonitric acids | Ontological structure of 2808 |
| 2809 | Diphosphorus pentaoxide; phosphoric acid; polyphosphoric acids, whether or not chemically defined | Ontological structure of 2809 |
| 2810 | Oxides of boron; boric acids | Ontological structure of 2810 |
| 2811 | Other inorganic acids and other inorganic oxygen compounds of non-metals | Ontological structure of 2811 |
| 2812 | Halides and halide oxides of non-metals | Ontological structure of 2812 |
| 2813 | Sulphides of non-metals; commercial phosphorus trisulphide | Ontological structure of 2813 |
| 2814 | Ammonia, anhydrous or in aqueous solution | Ontological structure of 2814 |
| 2815 | Sodium hydroxide (caustic soda); potassium hydroxide (caustic potash); peroxides of sodium or potassium | Ontological structure of 2815 |
| 2816 | Hydroxide and peroxide of magnesium; oxides, hydroxides and peroxides, of strontium or barium | Ontological structure of 2816 |
| 2817 | Zinc oxide; zinc peroxide | Ontological structure of 2817 |
| 2818 | Artificial corundum, whether or not chemically defined; aluminium oxide; aluminium hydroxide | Ontological structure of 2818 |
| 2819 | Chromium oxides and hydroxides | Ontological structure of 2819 |
| 2820 | Manganese oxides | Ontological structure of 2820 |
| 2821 | Iron oxides and hydroxides; earth colours containing 70 % or more by weight of combined iron evaluated as Fe@2O@3 | Ontological structure of 2821 |
| 2822 | Cobalt oxides and hydroxides; commercial cobalt oxides | Ontological structure of 2822 |
| 2823 | Titanium oxides | Ontological structure of 2823 |
| 2824 | Lead oxides; red lead and orange lead | Ontological structure of 2824 |
| 2825 | Hydrazine and hydroxylamine and their inorganic salts; other inorganic bases; other metal oxides, hydroxides and peroxides | Ontological structure of 2825 |
| 2826 | Fluorides; fluorosilicates, fluoroaluminates and other complex fluorine salts | Ontological structure of 2826 |
| 2827 | Chlorides, chloride oxides and chloride hydroxides; bromides and bromide oxides; iodides and iodide oxides | Ontological structure of 2827 |
| 2828 | Hypochlorites; commercial calcium hypochlorite; chlorites; hypobromites | Ontological structure of 2828 |
| 2829 | Chlorates and perchlorates; bromates and perbromates; iodates and periodates | Ontological structure of 2829 |
| 2830 | Sulphides; polysulphides, whether or not chemically defined | Ontological structure of 2830 |
| 2831 | Dithionites and sulphoxylates | Ontological structure of 2831 |
| 2832 | Sulphites; thiosulphates | Ontological structure of 2832 |
| 2833 | Sulphates; alums; peroxosulphates (persulphates) | Ontological structure of 2833 |
| 2834 | Nitrites; nitrates | Ontological structure of 2834 |
| 2835 | Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined | Ontological structure of 2835 |
| 2836 | Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate | Ontological structure of 2836 |
| 2837 | Cyanides, cyanide oxides and complex cyanides | Ontological structure of 2837 |
| 2839 | Silicates; commercial alkali metal silicates | Ontological structure of 2839 |
| 2840 | Borates; peroxoborates (perborates) | Ontological structure of 2840 |
| 2841 | Salts of oxometallic or peroxometallic acids | Ontological structure of 2841 |
| 2842 | Other salts of inorganic acids or peroxoacids (including aluminosilicates whether or not chemically defined), other than azides | Ontological structure of 2842 |
| 2843 | Colloidal precious metals; inorganic or organic compounds of precious metals, whether or not chemically defined; amalgams of precious metals | Ontological structure of 2843 |
| 2844 | Radioactive chemical elements and radioactive isotopes (including the fissile or fertile chemical elements and isotopes) and their compounds; mixtures and residues containing these products | Ontological structure of 2844 |
| 2845 | Isotopes other than those of heading 2844; compounds, inorganic or organic, of such isotopes, whether or not chemically defined | Ontological structure of 2845 |
| 2846 | Compounds, inorganic or organic, of rare-earth metals, of yttrium or of scandium or of mixtures of these metals | Ontological structure of 2846 |
| 2847 | Hydrogen peroxide, whether or not solidified with urea | Ontological structure of 2847 |
| 2849 | Carbides, whether or not chemically defined | Ontological structure of 2849 |
| 2850 | Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, other than compounds which are also carbides of heading 2849 | Ontological structure of 2850 |
| 2852 | Inorganic or organic compounds of mercury, whether or not chemically defined, excluding amalgams | Ontological structure of 2852 |
| 2853 | Phosphides, whether or not chemically defined, excluding ferrophosphorus; other inorganic compounds (including distilled or conductivity water and water of similar purity); liquid air (whether or not rare gases have been removed); compressed air; amalgams, other than amalgams of precious metals | Ontological structure of 2853 |