Inorganic chemicals; compounds of precious metals, rare-earth metals, radioactive elements or isotopes

The 50 headings of chapter 28

• 2801: Fluorine, chlorine, bromine and iodine (4 codes, General duty Free to 5.5%)
• 2802: Sulfur, sublimed or precipitated; colloidal sulfur (1 code, General duty Free)
• 2803: Carbon (carbon blacks and other forms of carbon not elsewhere specified or included) (2 codes, General duty Free)
• 2804: Hydrogen, rare gases and other nonmetals (16 codes, General duty Free to 5.5%)
• 2805: Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed; mercury (13 codes, General duty Free to 5.5%)
• 2806: Hydrogen chloride (Hydrochloric acid); chlorosulfuric acid (2 codes, General duty Free to 4.2%)
• 2807: Sulfuric acid; oleum (1 code, General duty Free)
• 2808: Nitric acid; sulfonitric acids (2 codes, General duty Free)
• 2809: Diphosphorus pentaoxide; phosphoric acid;polyphosphoric acids, whether or not chemically defined (5 codes, General duty Free)
• 2810: Oxides of boron; boric acids (1 code, General duty 1.5%)
• 2811: Other inorganic acids and other inorganic oxygen compounds of nonmetals (13 codes, General duty Free to 4.2%)
• 2812: Halides and halide oxides of nonmetals (11 codes, General duty Free to 3.7%)
• 2813: Sulfides of nonmetals; commercial phosphorus trisulfide (4 codes, General duty Free to 3.7%)
• 2814: Ammonia, anhydrous or in aqueous solution (2 codes, General duty Free)
• 2815: Sodium hydroxide (Caustic soda); potassium hydroxide (Caustic potash); peroxides of sodium or potassium (5 codes, General duty Free to 3.7%)
• 2816: Hydroxide and peroxide of magnesium; oxides, hydroxides and peroxides, of strontium or barium (3 codes, General duty 2% to 4.2%)
• 2817: Zinc oxide; zinc peroxide (1 code, General duty Free)
• 2818: Artificial corundum, whether or not chemically defined; aluminum oxide; aluminum hydroxide (5 codes, General duty Free to 1.3%)
• 2819: Chromium oxides and hydroxides (2 codes, General duty 3.7%)
• 2820: Manganese oxides (2 codes, General duty 4.7%)
• 2821: Iron oxides and hydroxides; earth colors containing 70 percent or more by weight of combined iron evaluated as Fe2O3 (6 codes, General duty 3.7% to 5.5%)
• 2822: Cobalt oxides and hydroxides; commercial cobalt oxides (2 codes, General duty 0.1%)
• 2823: Titanium oxides (1 code, General duty 5.5%)
• 2824: Lead oxides; red lead and orange lead (4 codes, General duty 3% to 5.5%)
• 2825: Hydrazine and hydroxylamine and their inorganic salts; other inorganic bases; other metal oxides, hydroxides and peroxides (19 codes, General duty Free to 5.5%)
• 2826: Fluorides; fluorosilicates, fluoroaluminates and other complex fluorine salts (8 codes, General duty Free to 4.1%)
• 2827: Chlorides, chloride oxides and chloride hydroxides; bromides and bromide oxides; iodides and iodide oxides (24 codes, General duty Free to 5.5%)
• 2828: Hypochlorites; commercial calcium hypochlorite; chlorites; hypobromites (2 codes, General duty 2.4% to 3.7%)
• 2829: Chlorates and perchlorates; bromates and perbromates; iodates and periodates (6 codes, General duty Free to 3.7%)
• 2830: Sulfides; polysulfides, whether or not chemically defined (5 codes, General duty Free to 3.7%)
• 2831: Dithionites and sulfoxylates (3 codes, General duty Free to 5.5%)
• 2832: Sulfites; thiosulfates (4 codes, General duty 1.5% to 3.1%)
• 2833: Sulfates; alums; peroxosulfates (persulfates) (21 codes, General duty Free to 5.5%)
• 2834: Nitrites; nitrates (7 codes, General duty Free to 5.5%)
• 2835: Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined (12 codes, General duty Free to 4.1%)
• 2836: Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate (15 codes, General duty Free to 5.5%)
• 2837: Cyanides, cyanide oxides and complex cyanides (6 codes, General duty Free to 1.7%)
• 2839: Silicates; commercial alkali metal silicates (4 codes, General duty 1.1% to 3.1%)
• 2840: Borates; peroxoborates (perborates) (5 codes, General duty 0.1% to 3.7%)
• 2841: Salts of oxometallic or peroxometallic acids (17 codes, General duty 1.5% to 5.5%)
• 2842: Other salts of inorganic acids or peroxoacids (including aluminosilicates whether or not chemically defined), other than azides (4 codes, General duty 3.1% to 3.7%)
• 2843: Colloidal precious metals; inorganic or organic compounds of precious metals, whether or not chemically defined; amalgams of precious metals (5 codes, General duty 3.7% to 5.5%)
• 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 (23 codes, General duty Free to 5.5%)
• 2845: Isotopes other than those of heading 2844; compounds, inorganic or organic, of such isotopes, whether or not chemically defined (5 codes, General duty Free)
• 2846: Compounds, inorganic or organic, of rare-earth metals, of yttrium or of scandium, or of mixtures of these metals (11 codes, General duty Free to 5.5%)
• 2847: Hydrogen peroxide, whether or not solidified with urea (1 code, General duty 3.7%)
• 2849: Carbides, whether or not chemically defined (7 codes, General duty Free to 5.5%)
• 2850: Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, other than compounds which are also carbides of heading 2849 (5 codes, General duty Free to 5.5%)
• 2852: Inorganic or organic compounds of mercury, whether or not chemically defined, excluding amalgams (4 codes, General duty Free to 3%)
• 2853: Phosphides, whether or not chemically defined, excluding ferrophosphorous; 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 (5 codes, General duty Free to 2.8%)

Where it sits in the schedule

Chapter 28 is in Section VI of the Harmonized System, chemical products (chapters 28 to 38). Rates are those printed in the 2026 HTS Revision 23; Chapter 99 duties (Section 232, Section 301, IEEPA) are charged on top and are not included.