28: Inorganic chemicals, precious metal compound, isotope

2801: Fluorine, chlorine, bromine and iodine 2802: Sulphur, sublimed or precipitated, colloidal sulphur 2803: Carbon (carbon blacks and other forms of carbon, nes) 2804: Hydrogen, rare gases, non-metallic elements 2805: Alkali, alkaline-earth metals, rare earths, mercury 2806: Hydrogen chloride, chlorosulphuric acid 2807: Sulphuric acid, oleum 2808: Nitric acid, sulphonitric acids 2809: Diphosphorus pentaoxide, phosphoric acids 2810: Oxides of boron, boric acids 2811: Inorganic acids, non-metal inorganics 2812: Halides and halide oxides of non-metals 2813: Sulphides of non-metals 2814: Ammonia, anhydrous or in aqueous solution 2815: Hydroxides and peroxides of sodium and potassium 2816: Magnesium, strontium, barium hydroxide, peroxide,oxid 2817: Zinc oxide and peroxide 2818: Aluminium oxide, hydroxide and artificial corundum 2819: Chromium oxides, hydroxides 2820: Manganese oxides 2821: Iron oxides, hydroxides, earth colours >70% iron 2822: Cobalt oxides and hydroxides 2823: Titanium oxides 2824: Lead oxides, red lead and orange lead 2825: Hydrazine, hydroxylamine, metal oxides, hydroxides ne 2826: Fluorides and complex fluorine salts 2827: Chlorides, bromides, iodides, oxides thereof 2828: Hypochlorites, chlorites and hypobromides 2829: Chlorates and per-, bromates and per-, iodates & per- 2830: Sulphides, polysulphides of metals 2831: Dithionites and sulphoxylates 2832: Sulphites, thiosulphates 2833: Sulphates, alums, peroxosulphates (persulphates) 2834: Nitrites, nitrates 2835: Phosphatic compounds 2836: Carbonates 2837: Cyanides 2838: Fulminates, cyanates and thiocyanates 2839: Silicates 2840: Borates, peroxoborates (perborates) 2841: Salts of oxometallic or peroxometallic acids 2842: Salts of inorganic acids, peroxoacids, except azides 2843: Precious metal colloids, compounds and amalgams 2844: Radioactive elements, isotopes, compounds and mixture 2845: Isotopes, nes and their compounds 2846: Compounds, mixes of rare-earths, yttrium, scandium ne 2847: Hydrogen peroxide, (including solidified with urea) 2848: Phosphides, excluding ferrophosphorus 2849: Carbides, whether or not chemically defined 2850: Hydrides, nitrides, azides, silicides and borides 2851: Inorganic compounds,liquid/compressed air, amalgam ne 28: Inorganic chemicals, precious metal compound, isotope