HTS Chapter 28 · Section VI
Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes
Chapter 28 averages a 2.5% general (MFN) duty across its 274 rated tariff lines, with the steepest line reaching 5.5%.
- 2.5%
- avg MFN duty
- 5.5%
- highest line
- 274
- rated tariff lines
- 29%
- enter duty-free
Tariff lines in Chapter 28 by duty-rate band
How the 274 rated lines in this chapter distribute across general (MFN) rate ranges
About HTS Chapter 28
HTS Chapter 28 - Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes - organizes 501 tariff classifications in the US Harmonized Tariff Schedule. Of these, 274 carry explicit duty rates at the tariff-line level, meaning importers can look up a specific Column 1 General (MFN) rate for every qualifying shipment. Chapter 28 sits within Section VI (Products of the Chemical or Allied Industries), which groups commercially related product categories together.
The average general duty rate across all tariff lines in this chapter is 2.5%, with the highest individual rate reaching 5.5%. Duty burden varies widely across tariff lines within this chapter, classification precision matters. Below, each line links to its individual detail page showing General, Special (FTA), and Column 2 rates.
Use this chapter page as the entry point for classifying any product that falls under inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes. The tree below preserves the HTS indentation hierarchy (heading → subheading → tariff line), so you can narrow from broad category to specific 8-10 digit code. All data comes from the US International Trade Commission (USITC) HTS 2026 Basic Edition, the official schedule of import duties used by US Customs and Border Protection.
Chapter 28 At a Glance
| Metric | Value | Notes |
|---|---|---|
| Total tariff classifications | 501 | All headings, subheadings, and tariff lines. |
| Lines with explicit rates | 274 | Tariff lines carrying a Column 1 General duty. |
| Average general rate | 2.5% | Mean MFN rate across rated lines. |
| Highest line rate | 5.5% | Peak Column 1 General rate within the chapter. |
Source: USITC Harmonized Tariff Schedule 2026 Basic Edition. Computed at last data refresh, see methodology.
Tariff Lines
2801 Fluorine, chlorine, bromine and iodine:
2801.10.00.00 Chlorine
kg Free
2801.20.00.00 Iodine
kg Free
2801.30 Fluorine; bromine:
2801.30.10.00 Fluorine
kg 3.7%
2801.30.20.00 Bromine
kg 5.5%
2802.00.00.00 Sulfur, sublimed or precipitated; colloidal sulfur
t Free
2803.00.00 Carbon (carbon blacks and other forms of carbon not elsewhere specified or included)
Free
2803.00.00.10 Carbon black
kg 2803.00.00.50 Other
kg 2804 Hydrogen, rare gases and other nonmetals:
2804.10.00.00 Hydrogen
thousand m3 3.7%
Rare gases:
2804.21.00.00 Argon
thousand m3 3.7%
2804.29.00 Other
3.7%
2804.29.00.10 Helium
thousand m3 2804.29.00.20 Neon
thousand m3 2804.29.00.30 Isotopically pure rare gases having a purity of 99 percent or more by volume
thousand m3 2804.29.00.55 Other
thousand m3 2804.30.00.00 Nitrogen
thousand m3 3.7%
2804.40.00.00 Oxygen
thousand m3 3.7%
2804.50.00 Boron; tellurium
Free
2804.50.00.10 Boron
kg 2804.50.00.20 Tellurium
kg Silicon:
2804.61.00.00 Containing by weight not less than 99.99 percent of silicon
kg Free
2804.69 Other:
2804.69.10.00 Containing by weight less than 99.99 percent but not less than 99 percent of silicon
kg, Si kg 5.3%
2804.69.50.00 Other
kg, Si kg 5.5%
2804.70.00.00 Phosphorus
kg Free
2804.80.00.00 Arsenic
kg Free
2804.90.00.00 Selenium
kg Free
2805 Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed; mercury:
Alkali or alkaline-earth metals:
2805.11.00.00 Sodium
kg 5.3%
2805.12.00.00 Calcium
kg 3%
2805.19 Other:
2805.19.10.00 Strontium
kg 3.7%
2805.19.20.00 Barium
kg Free
2805.19.90 Other
5.5%
2805.19.90.10 Lithium
kg 2805.19.90.90 Other
kg 2805.30.00 Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed
5%
Not intermixed or interalloyed:
2805.30.00.05 Lanthanum
kg 2805.30.00.10 Cerium
kg 2805.30.00.15 Praseodymium
kg 2805.30.00.20 Neodymium
kg 2805.30.00.50 Other
kg 2805.30.00.90 Other
kg 2805.40.00.00 Mercury
kg 1.7%
II. INORGANIC ACIDS AND INORGANIC OXYGEN COMPOUNDS OF NONMETALS
2806 Hydrogen chloride (Hydrochloric acid); chlorosulfuric acid:
2806.10.00.00 Hydrogen chloride (Hydrochloric acid)
t Free
2806.20.00.00 Chlorosulfuric acid
kg 4.2%
2807.00.00.00 Sulfuric acid; oleum
t Free
2808.00.00 Nitric acid; sulfonitric acids
Free
2808.00.00.10 Nitric acid
kg 2808.00.00.20 Sulfonitric acids
kg 2809 Diphosphorus pentaoxide; phosphoric acid;polyphosphoric acids, whether or not chemically defined:
2809.10.00.00 Diphosphorus pentaoxide
kg Free
2809.20.00 Phosphoric acid and polyphosphoric acids
Free
Phosphoric acid:
Fertilizer grade:
2809.20.00.10 Containing less than 65 percent available diphosphorus pentaoxide (P2O5) equivalents
t 2809.20.00.20 Other
t 2809.20.00.30 Other
t 2809.20.00.40 Polyphosphoric acids
t 2810.00.00.00 Oxides of boron; boric acids
t 1.5%
2811 Other inorganic acids and other inorganic oxygen compounds of nonmetals:
Other inorganic acids:
2811.11.00.00 Hydrogen fluoride (Hydrofluoric acid)
kg Free
2811.12.00.00 Hydrogen cyanide (hydrocyanic acid)
kg 4.2%
2811.19 Other:
2811.19.10.00 Arsenic acid
kg 2.3%
2811.19.30.00 Hydrobromic acid
kg Free
2811.19.61 Other
4.2%
2811.19.61.10 Sulfamic acid
kg 2811.19.61.90 Other
kg Other inorganic oxygen compounds of nonmetals:
2811.21.00.00 Carbon dioxide
t 3.7%
2811.22 Silicon dioxide:
2811.22.10.00 Synthetic silica gel
kg 3.7%
2811.22.50.00 Other
kg Free
2811.29 Other:
2811.29.10.00 Arsenic trioxide
kg Free
2811.29.20.00 Selenium dioxide
kg Free
2811.29.30.00 Sulfur dioxide
kg 4.2%
2811.29.50.00 Other
kg 3.7%
III. HALOGEN OR SULFUR COMPOUNDS OF NONMETALS
2812 Halides and halide oxides of nonmetals:
Chlorides and chloride oxides:
2812.11.00.00 Carbonyl dichloride (phosgene)
kg 3.7%
2812.12.00.00 Phosphorous oxychloride
kg 3.7%
2812.13.00.00 Phosphorous trichloride
kg 3.7%
2812.14.00.00 Phosphorous pentachloride
kg Free
2812.15.00.00 Sulfur monochloride
kg 3.7%
2812.16.00.00 Sulfur dichloride
kg 3.7%
2812.17.00.00 Thionyl chloride
kg 3.7%
2812.19.00 Other
3.7%
2812.19.00.10 Arsenic trichloride
kg 2812.19.00.90 Other
kg 2812.90.00 Other
3.7%
2812.90.00.10 Sulfur hexafluoride
kg 2812.90.00.90 Other
kg 2813 Sulfides of nonmetals; commercial phosphorus trisulfide:
2813.10.00.00 Carbon disulfide
kg 3.7%
2813.90 Other:
2813.90.10.00 Of arsenic
kg Free
2813.90.20.00 Of phosphorus
kg Free
2813.90.50.00 Other
kg 3.7%
IV. INORGANIC BASES AND OXIDES, HYDROXIDES AND PEROXIDES OF METALS
2814 Ammonia, anhydrous or in aqueous solution:
2814.10.00.00 Anhydrous ammonia
t Free
2814.20.00.00 Ammonia in aqueous solution
t, NH3 t Free
2815 Sodium hydroxide (Caustic soda); potassium hydroxide (Caustic potash); peroxides of sodium or potassium:
Sodium hydroxide (Caustic soda):
2815.11.00.00 Solid
kg Free
2815.12.00.00 In aqueous solution (Soda lye or liquid soda)
kg, NaOH kg Free
2815.20.00 Potassium hydroxide (Caustic potash)
Free
2815.20.00.50 In solid form
kg 2815.20.00.90 Other
kg 2815.30.00.00 Peroxides of sodium or potassium
kg 3.7%
2816 Hydroxide and peroxide of magnesium; oxides, hydroxides and peroxides, of strontium or barium:
2816.10.00.00 Hydroxide and peroxide of magnesium
kg 3.1%
2816.40 Oxides, hydroxides and peroxides, of strontium or barium:
2816.40.10.00 Of strontium
kg 4.2%
2816.40.20.00 Of barium
kg 2%
2817.00.00.00 Zinc oxide; zinc peroxide
kg Free
2818 Artificial corundum, whether or not chemically defined; aluminum oxide; aluminum hydroxide:
2818.10 Artificial corundum, whether or not chemically defined:
2818.10.10.00 Crude
t Free
2818.10.20 In grains, or ground, pulverized or refined
1.3%
2818.10.20.10 White, pink or ruby, containing more than 97.5 percent by weight of aluminum oxide
kg 2818.10.20.90 Other
kg 2818.20.00.00 Aluminum oxide, other than artificial corundum
kg Free
2818.30.00.00 Aluminum hydroxide
kg Free
2819 Chromium oxides and hydroxides:
2819.10.00.00 Chromium trioxide
kg 3.7%
2819.90.00.00 Other
kg 3.7%
2820 Manganese oxides:
2820.10.00.00 Manganese dioxide
kg 4.7%
2820.90.00.00 Other
kg 4.7%
2821 Iron oxides and hydroxides; earth colors containing 70 percent or more by weight of combined iron evaluated as Fe2O3:
2821.10.00 Iron oxides and hydroxides
3.7%
Synthetic pigments:
2821.10.00.10 Black
kg 2821.10.00.20 Red
kg 2821.10.00.30 Yellow
kg 2821.10.00.40 Other
kg 2821.10.00.50 Other
kg 2821.20.00.00 Earth colors
kg 5.5%
2822.00.00 Cobalt oxides and hydroxides; commercial cobalt oxides
0.1%
2822.00.00.10 Cobalt(II, III) oxide (cobalt tetroxide)
kg 2822.00.00.90 Other
kg 2823.00.00.00 Titanium oxides
kg 5.5%
2824 Lead oxides; red lead and orange lead:
2824.10.00.00 Lead monoxide (litharge, massicot)
kg 3%
2824.90 Other:
2824.90.10.00 Lead suboxide (leady litharge)
kg 5.5%
2824.90.20.00 Red lead and orange lead
kg 3.4%
2824.90.50.00 Other
kg 4.8%
2825 Hydrazine and hydroxylamine and their inorganic salts; other inorganic bases; other metal oxides, hydroxides and peroxides:
2825.10.00.00 Hydrazine and hydroxylamine and their inorganic salts
kg 3.7%
2825.20.00.00 Lithium oxide and hydroxide
kg 3.7%
2825.30.00 Vanadium oxides and hydroxides
5.5%
2825.30.00.10 Vanadium pentoxide (anhydride)
kg, V kg 2825.30.00.50 Other
kg, V kg 2825.40.00.00 Nickel oxides and hydroxides
kg Free
2825.50 Copper oxides and hydroxides:
2825.50.10.00 Cupric oxide
kg 4.3%
2825.50.20.00 Cuprous oxide
kg 5%
2825.50.30.00 Copper hydroxides
kg 3.9%
2825.60.00 Germanium oxides and zirconium dioxide
3.7%
2825.60.00.10 Germanium dioxide
kg 2825.60.00.20 Zirconium dioxide
kg 2825.60.00.50 Other
kg 2825.70.00.00 Molybdenum oxides and hydroxides
kg 3.2%
2825.80.00.00 Antimony oxides
kg Free
2825.90 Other:
2825.90.10.00 Beryllium oxide and hydroxide
kg 3.7%
2825.90.15.00 Niobium oxide
kg 3.7%
2825.90.20.00 Tin oxides
kg 4.2%
2825.90.30.00 Tungsten oxides
kg, W kg 5.5%
2825.90.75.00 Cadmium oxide
kg Free
2825.90.90.00 Other
kg 3.7%
V. SALTS AND PEROXYSALTS, OF INORGANIC ACIDS AND METALS
2826 Fluorides; fluorosilicates, fluoroaluminates and other complex fluorine salts:
Fluorides:
2826.12.00.00 Of aluminum
kg Free
2826.19 Other:
2826.19.10.00 Of ammonium
kg 3.1%
2826.19.20.00 Of sodium
kg 3.7%
2826.19.90.00 Other
kg 3.9%
2826.30.00.00 Sodium hexafluoroaluminate (Synthetic cryolite)
t Free
2826.90 Other:
2826.90.10.00 Fluorosilicates of sodium or of potassium
kg 4.1%
2826.90.90 Other
3.1%
2826.90.90.10 Lithium hexafluorophosphate
kg 2826.90.90.90 Other
kg 2827 Chlorides, chloride oxides and chloride hydroxides; bromides and bromide oxides; iodides and iodide oxides:
2827.10.00.00 Ammonium chloride
kg 2.9%
2827.20.00.00 Calcium chloride
kg Free
Other chlorides:
2827.31.00.00 Of magnesium
kg 1.5%
2827.32.00.00 Of aluminum
kg Free
2827.35.00.00 Of nickel
kg 3.7%
2827.39 Other:
2827.39.10.00 Of vanadium
kg, V kg 5.5%
2827.39.25.00 Of tin
kg 4.2%
2827.39.30.00 Of titanium
kg 4.9%
2827.39.40.00 Of tungsten
kg, W kg 5.5%
2827.39.45.00 Of barium
kg 4.2%
2827.39.55.00 Of iron
kg 3.7%
2827.39.60.00 Of cobalt
kg 4.2%
2827.39.65.00 Of zinc
kg 1.6%
2827.39.90 Other
3.7%
2827.39.90.10 Of lithium
kg 2827.39.90.50 Other
kg Chloride oxides and chloride hydroxides:
2827.41.00.00 Of copper
kg 3.9%
2827.49 Other:
2827.49.10.00 Of vanadium
kg, V kg 5.5%
2827.49.50.00 Other
kg 5.5%
Bromides and bromide oxides:
2827.51.00.00 Bromides of sodium or of potassium
kg Free
2827.59 Other:
2827.59.25.00 Of ammonium, of calcium or of zinc
kg Free
2827.59.51.00 Other
kg 3.6%
2827.60 Iodides and iodide oxides:
2827.60.10.00 Of calcium or of copper
kg Free
2827.60.20.00 Of potassium
kg 2.8%
2827.60.51.00 Other
kg 4.2%
2828 Hypochlorites; commercial calcium hypochlorite; chlorites; hypobromites:
2828.10.00.00 Commercial calcium hypochlorite and other calcium hypochlorites
kg 2.4%
2828.90.00.00 Other
kg 3.7%
2829 Chlorates and perchlorates; bromates and perbromates; iodates and periodates:
Chlorates:
2829.11.00.00 Of sodium
kg Free
2829.19.01.00 Other
kg 3.3%
2829.90 Other:
2829.90.05.00 Potassium bromate
kg Free
2829.90.25.00 Sodium bromate
kg Free
Other:
2829.90.40.00 Of potassium
kg 3.1%
2829.90.61.00 Other
kg 3.7%
2830 Sulfides; polysulfides, whether or not chemically defined:
2830.10.00.00 Sodium sulfides
kg 3.7%
2830.90 Other:
2830.90.10.00 Zinc sulfide, luminescent grade having a purity of 99.99 percent or more by weight
kg Free
2830.90.15.00 Other zinc sulfide
kg 2.8%
2830.90.20.00 Cadmium sulfide
kg 3.1%
2830.90.90.00 Other
kg 3%
2831 Dithionites and sulfoxylates:
2831.10 Of sodium:
2831.10.10.00 Sodium formaldehyde sulfoxylate
kg Free
2831.10.50.00 Other
kg 5.5%
2831.90.00.00 Other
kg 5.5%
2832 Sulfites; thiosulfates:
2832.10.00.00 Sodium sulfites
kg 1.5%
2832.20.00.00 Other sulfites
kg 3.1%
2832.30 Thiosulfates:
2832.30.10.00 Sodium thiosulfate
kg 1.5%
2832.30.50.00 Other
kg 3.1%
2833 Sulfates; alums; peroxosulfates (persulfates):
Sodium sulfates:
2833.11 Disodium sulfate:
2833.11.10.00 Salt cake
t Free
2833.11.50 Other
0.4%
2833.11.50.10 Anhydrous
t 2833.11.50.50 Other
t 2833.19.00.00 Other
kg Free
Other sulfates:
2833.21.00.00 Of magnesium
kg 3.7%
2833.22.00.00 Of aluminum
kg Free
2833.24.00.00 Of nickel
kg 3.2%
2833.25.00.00 Of copper
kg, Cu kg 1.4%
2833.27.00.00 Of barium
kg 0.6%
2833.29 Other:
2833.29.10.00 Of cobalt
kg 1.4%
2833.29.20.00 Of iron
kg Free
2833.29.30.00 Of vanadium
kg, V kg 5.5%
2833.29.40.00 Of chromium
kg 3.7%
2833.29.45.00 Of zinc
kg 1.6%
2833.29.51 Other
3.7%
2833.29.51.10 Of manganese
kg 2833.29.51.90 Other
kg 2833.30.00.00 Alums
kg 1.6%
2833.40 Peroxosulfates (persulfates):
2833.40.20.00 Of sodium
kg 3.7%
2833.40.60 Other
3.1%
2833.40.60.10 Of potassium
kg 2833.40.60.20 Of ammonium
kg 2833.40.60.50 Other
kg 2834 Nitrites; nitrates:
2834.10 Nitrites:
2834.10.10.00 Of sodium
kg 5.5%
2834.10.50.00 Other
kg 3.1%
Nitrates:
2834.21.00.00 Of potassium
t Free
2834.29 Other:
2834.29.05.00 Of bismuth
kg 5.5%
2834.29.10.00 Of calcium
t Free
2834.29.20.00 Of strontium
kg 4.2%
2834.29.51.00 Other
kg 3.5%
2835 Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined:
2835.10.00.00 Phosphinates (hypophosphites) and phosphonates (phosphites)
kg 3.1%
Phosphates:
2835.22.00.00 Of mono- or disodium
kg 1.4%
2835.24.00.00 Of potassium
kg 3.1%
2835.25.00.00 Calcium hydrogenorthophosphate ("Dicalcium phosphate")
kg Free
2835.26.00.00 Other phosphates of calcium
kg Free
2835.29 Other:
2835.29.10.00 Of aluminum
kg Free
2835.29.20.00 Of triammonium
kg 1.5%
2835.29.30.00 Of trisodium
kg 2.2%
2835.29.51.00 Other
kg 4.1%
Polyphosphates:
2835.31.00.00 Sodium triphosphate (Sodium tripolyphosphate)
kg 1.4%
2835.39 Other:
2835.39.10.00 Of potassium
kg 3.1%
2835.39.50.00 Other
kg 3.7%
2836 Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate:
2836.20.00.00 Disodium carbonate
kg 1.2%
2836.30.00.00 Sodium hydrogencarbonate (Sodium bicarbonate)
kg Free
2836.40 Potassium carbonates:
2836.40.10.00 Dipotassium carbonate
kg 1.9%
2836.40.20.00 Potassium hydrogencarbonate (Potassium bicarbonate)
kg 1.3%
2836.50.00.00 Calcium carbonate
kg Free
2836.60.00.00 Barium carbonate
kg 2.3%
Other:
2836.91.00 Lithium carbonates
3.7%
2836.91.00.10 U.S.P. grade
kg 2836.91.00.50 Other
kg 2836.92.00.00 Strontium carbonate
kg 4.2%
2836.99 Other:
2836.99.10.00 Cobalt carbonates
kg 4.2%
2836.99.20.00 Bismuth carbonate
kg 5.5%
2836.99.30.00 Commercial ammonium carbonate and other ammonium carbonates
kg 1.7%
2836.99.40.00 Lead carbonates
kg 0.5%
2836.99.50 Other
3.7%
2836.99.50.10 Zirconium carbonates
kg 2836.99.50.50 Other
kg 2837 Cyanides, cyanide oxides and complex cyanides:
Cyanides and cyanide oxides:
2837.11.00.00 Of sodium
kg Free
2837.19.01 Other
Free
2837.19.01.10 Potassium cyanide
kg 2837.19.01.15 Calcium cyanide
kg 2837.19.01.25 Other
kg 2837.20 Complex cyanides:
2837.20.10.00 Potassium ferricyanide
kg 1.1%
2837.20.51.00 Other
kg 1.7%
2839 Silicates; commercial alkali metal silicates:
Of sodium:
2839.11.00.00 Sodium metasilicates
kg 1.1%
2839.19.00.00 Other
kg 1.1%
2839.90 Other:
2839.90.10.00 Of potassium
kg 3.1%
2839.90.50.00 Other
kg 3.1%
2840 Borates; peroxoborates (perborates):
Disodium tetraborate (refined borax):
2840.11.00.00 Anhydrous
kg 0.3%
2840.19.00.00 Other
kg 0.1%
2840.20.00.00 Other borates
kg 3.7%
2840.30.00 Peroxoborates (perborates)
3.7%
2840.30.00.10 Sodium perborate
kg 2840.30.00.50 Other
kg 2841 Salts of oxometallic or peroxometallic acids:
2841.30.00.00 Sodium dichromate
kg 2.4%
2841.50 Other chromates and dichromates; peroxochromates:
2841.50.10.00 Potassium dichromate
kg 1.5%
2841.50.91.00 Other
kg 3.1%
Manganites, manganates and permanganates:
2841.61.00.00 Potassium permanganate
kg 5%
2841.69.00 Other
5%
2841.69.00.10 Sodium permanganate
kg 2841.69.00.90 Other
kg 2841.70 Molybdates:
2841.70.10.00 Of ammonium
kg, Mo kg 4.3%
2841.70.50.00 Other
kg, Mo kg 3.7%
2841.80.00 Tungstates (wolframates)
5.5%
2841.80.00.10 Of ammonium
kg, W kg 2841.80.00.20 Of calcium
kg, W kg 2841.80.00.50 Other
kg, W kg 2841.90 Other:
2841.90.10.00 Vanadates
kg, V kg 5.5%
2841.90.20.00 Ammonium perrhenate
kg 3.1%
2841.90.30.00 Potassium stannate
kg 3.1%
2841.90.40.00 Aluminates
kg 3.1%
2841.90.45.00 Chromates of zinc or of lead
kg 3.7%
2841.90.50.00 Other
kg 3.7%
2842 Other salts of inorganic acids or peroxoacids (including aluminosilicates whether or not chemically defined), other than azides:
2842.10.00.00 Double or complex silicates, including aluminosilicates whether or not chemically defined
kg 3.7%
2842.90 Other:
2842.90.10.00 Fulminates, cyanates and thiocyanates
kg 3.1%
2842.90.90 Other
3.3%
2842.90.90.10 Selenides and tellurides
kg 2842.90.90.50 Other
kg VI. MISCELLANEOUS
2843 Colloidal precious metals; inorganic or organic compounds of precious metals, whether or not chemically defined; amalgams of precious metals:
2843.10.00.00 Colloidal precious metals
g 5.5%
Silver compounds:
2843.21.00.00 Silver nitrate
kg 3.7%
2843.29.01.00 Other
kg 3.7%
2843.30.00.00 Gold compounds
kg 5%
2843.90.00.00 Other compounds; amalgams
kg 3.7%
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:
2844.10 Natural uranium and its compounds; alloys, dispersions (including cermets), ceramic products and mixtures containing natural uranium or natural uranium compounds:
2844.10.10.00 Uranium metal
kg 5%
2844.10.20 Uranium compounds
Free
2844.10.20.10 Oxide
kg 2844.10.20.25 Hexafluoride
kg 2844.10.20.55 Other
kg 2844.10.50.00 Other
kg 5%
2844.20.00 Uranium enriched in U235 and its compounds; plutonium and its compounds; alloys, dispersions (including cermets), ceramic products and mixtures containing uranium enriched in U235, plutonium or compounds of these products
Free
Uranium compounds:
2844.20.00.10 Oxide
kg 2844.20.00.20 Fluorides
kg 2844.20.00.30 Other
kg 2844.20.00.50 Other
kg 2844.30 Uranium depleted in U235 and its compounds; thorium and its compounds; alloys, dispersions (including cermets), ceramic products and mixtures containing uranium depleted in U235, thorium, or compounds of these products:
2844.30.10.00 Thorium compounds
kg 5.5%
2844.30.20 Uranium compounds
Free
2844.30.20.10 Oxide
kg 2844.30.20.20 Fluorides
kg 2844.30.20.50 Other
kg 2844.30.50 Other
5%
2844.30.50.10 Uranium metal
kg 2844.30.50.50 Other
kg Radioactive elements and isotopes and compounds other than those of subheading 2844.10, 2844.20 or 2844.30; alloys, dispersions (including cermets), ceramic products and mixtures containing these elements, isotopes or compounds; radioactive residues:
2844.41.00.00 Tritium and its compounds; alloys, dispersions (including cermets), ceramic products and mixtures containing tritium or its compounds
kg Free
2844.42.00.00 Actinium-225, actinium-227, californium-253, curium-240, curium-241, curium-242, curium-243, curium-244, einsteinium-253, einsteinium-254, gadolinium-148, polonium-208, polonium-209, polonium-210, radium-223, uranium-230 or uranium-232, and their compounds; alloys, dispersions (including cermets), ceramic products and mixtures containing these elements or compounds
GBq Free
2844.43.00 Other radioactive elements and isotopes and compounds; other alloys, dispersions (including cermets), ceramic products and mixtures containing these elements, isotopes or compounds
Free
2844.43.00.10 Elements, isotopes and compounds with cobalt-60 radioactivity only
GBq Other elements, isotopes and compounds:
2844.43.00.21 Americium-241, californium-252, cesium-137, gadolinium-153, idium-192, promethium-147, radium-226, selenium-75, or ytterbium-169
GBq 2844.43.00.28 Other
GBq 2844.43.00.50 Other
kg 2844.44.00.00 Radioactive residues
kg Free
2844.50.00.00 Spent (irradiated) fuel elements (cartridges) of nuclear reactors
kg Free
2845 Isotopes other than those of heading 2844; compounds, inorganic or organic, of such isotopes, whether or not chemically defined:
2845.10.00.00 Heavy water (Deuterium oxide)
kg Free
2845.20.00.00 Boron enriched in boron-10 and its compounds
kg Free
2845.30.00.00 Lithium enriched in lithium-6 and its compounds
kg Free
2845.40.00.00 Helium-3
kg Free
2845.90.01.00 Other
kg Free
2846 Compounds, inorganic or organic, of rare-earth metals, of yttrium or of scandium, or of mixtures of these metals:
2846.10.00 Cerium compounds
5.5%
2846.10.00.10 Cerium oxides
kg 2846.10.00.50 Other
kg 2846.90 Other:
2846.90.20 Mixtures of rare-earth oxides or of rare-earth chlorides
Free
Rare-earth oxides except cerium oxides:
2846.90.20.05 Containing lanthanum as the predominant metal
kg 2846.90.20.15 Containing yttrium or scandium as the predominant metal
kg 2846.90.20.40 Other
kg Rare-earth chlorides except cerium chlorides:
2846.90.20.82 Containing yttrium or scandium as the predominant metal
kg 2846.90.20.84 Other
kg Other:
2846.90.40.00 Yttrium bearing materials and compounds containing by weight more than 19 percent but less than 85 percent yttrium oxide equivalent
kg Free
2846.90.80 Other
3.7%
Mixtures of rare-earth carbonates other than of cerium carbonate:
2846.90.80.70 Containing lanthanum as the predominant metal
kg 2846.90.80.75 Other
kg 2846.90.80.90 Other
kg 2847.00.00.00 Hydrogen peroxide, whether or not solidified with urea
kg 3.7%
2849 Carbides, whether or not chemically defined:
2849.10.00.00 Of calcium
kg 1.8%
2849.20 Of silicon:
2849.20.10.00 Crude
kg Free
2849.20.20.00 In grains, or ground, pulverized or refined
kg 0.5%
2849.90 Other:
2849.90.10.00 Of boron
kg 3.7%
2849.90.20.00 Of chromium
kg 4.2%
2849.90.30.00 Of tungsten
kg, W kg 5.5%
2849.90.50.00 Other
kg 3.7%
2850.00 Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, other than compounds which are also carbides of heading 2849:
2850.00.05.00 Of calcium
kg Free
2850.00.07.00 Of titanium
kg 4.9%
2850.00.10.00 Of tungsten
kg, W kg 5.5%
2850.00.20.00 Of vanadium
kg, V kg 5.5%
2850.00.50.00 Other
kg 3.7%
2852 Inorganic or organic compounds of mercury, whether or not chemically defined, excluding amalgams:
2852.10 Chemically defined:
2852.10.10.00 Mercuric oxide, mercuric cyanide, mercuric oxycyanide and mercuric potassium cyanide
kg Free
2852.10.90.00 Other
kg 3%
2852.90 Other:
2852.90.05.00 Albuminates, tannates and phosphides of mercury
kg Free
2852.90.90.00 Other
kg 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:
2853.10.00.00 Cyanogen chloride (chloorcyan)
kg 2.8%
2853.90 Other:
Phosphides, whether or not chemically defined, excluding ferrophosphorous:
2853.90.10.00 Of copper (phosphor copper), containing more than 15 percent by weight of phosphorous
kg 2.6%
2853.90.50.00 Of other metals or nonmetals
kg Free
2853.90.90 Other
2.8%
2853.90.90.10 Gallium arsenide wafers, undoped
kg 2853.90.90.90 Other
kg I. HYDROCARBONS AND THEIR HALOGENATED, SULFONATED, NITRATED OR NITROSATED DERIVATIVES
Frequently Asked Questions
What does HTS Chapter 28 cover? ▼
HTS Chapter 28 covers Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes. It contains 501 individual tariff classifications, of which 274 have specified duty rates. This chapter falls under Section VI (Products of the Chemical or Allied Industries).
What is the average tariff rate for Chapter 28? ▼
The average general (MFN) duty rate across all tariff lines in Chapter 28 is 2.5%. The highest individual rate in this chapter is 5.5%. Actual duty on a specific product depends on its precise HTS classification.
How do I find the correct HTS code for my product? ▼
Browse the tariff lines listed below organized by heading and subheading. Each item with an HTS number links to its full detail page showing general, special, and Column 2 duty rates. For complex classifications, consult a licensed customs broker or contact US Customs and Border Protection (CBP).
Are there any duty-free items in Chapter 28? ▼
Yes, many chapters contain items with a "Free" general rate, meaning no duty is assessed for imports from most-favored-nation countries. Look for items marked "Free" in the tariff lines table below. Additional preferential rates may also apply under free trade agreements.
Where does PlainTariff get its tariff data? ▼
All tariff data comes from the U.S. International Trade Commission (USITC) Harmonized Tariff Schedule (HTS) 2026 Basic Edition, the official schedule of US import duties.
Learn More About Tariffs
Next steps
Find the exact rate for your product within Chapter 28.
- Click any tariff line above to see its General, Special, and Column 2 rates. Tariff lines above
- Estimate the landed duty cost on a shipment in this chapter. Tariff calculator
- Search the full schedule by product description. Search HTS
The chapter average is an orientation only, duty is set per tariff line, and Special preferential rates may apply to qualifying origins.
Related
Sources: U.S. International Trade Commission Harmonized Tariff Schedule (2026 Basic Edition) and FAO FAOSTAT Trade: Crops and Livestock. See our methodology for how figures are computed.
Every figure on PlainTariff is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.