CHAPTER 28
Inorganic Chemicals
Section VI of the U.S. Harmonized Tariff Schedule. 50 headings.
Headings in this chapter
2801
Fluorine, chlorine, bromine and iodine:
2802
Sulfur, sublimed or precipitated; colloidal sulfur
2803
Carbon (carbon blacks and other forms of carbon not elsewhere specified or included)
2804
Hydrogen, rare gases and other nonmetals:
2805
Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed; mercury:
2806
Hydrogen chloride (Hydrochloric acid); chlorosulfuric acid:
2807
Sulfuric acid; oleum
2808
Nitric acid; sulfonitric acids
2809
Diphosphorus pentaoxide; phosphoric acid;polyphosphoric acids, whether or not chemically defined:
2810
Oxides of boron; boric acids
2811
Other inorganic acids and other inorganic oxygen compounds of nonmetals:
2812
Halides and halide oxides of nonmetals:
2813
Sulfides of nonmetals; commercial phosphorus trisulfide:
2814
Ammonia, anhydrous or in aqueous solution:
2815
Sodium hydroxide (Caustic soda); potassium hydroxide (Caustic potash); peroxides of sodium or potassium:
2816
Hydroxide and peroxide of magnesium; oxides, hydroxides and peroxides, of strontium or barium:
2817
Zinc oxide; zinc peroxide
2818
Artificial corundum, whether or not chemically defined; aluminum oxide; aluminum hydroxide:
2819
Chromium oxides and hydroxides:
2820
Manganese oxides:
2821
Iron oxides and hydroxides; earth colors containing 70 percent or more by weight of combined iron evaluated as Fe2O3:
2822
Cobalt oxides and hydroxides; commercial cobalt oxides
2823
Titanium oxides
2824
Lead oxides; red lead and orange lead:
2825
Hydrazine and hydroxylamine and their inorganic salts; other inorganic bases; other metal oxides, hydroxides and peroxides:
2826
Fluorides; fluorosilicates, fluoroaluminates and other complex fluorine salts:
2827
Chlorides, chloride oxides and chloride hydroxides; bromides and bromide oxides; iodides and iodide oxides:
2828
Hypochlorites; commercial calcium hypochlorite; chlorites; hypobromites:
2829
Chlorates and perchlorates; bromates and perbromates; iodates and periodates:
2830
Sulfides; polysulfides, whether or not chemically defined:
2831
Dithionites and sulfoxylates:
2832
Sulfites; thiosulfates:
2833
Sulfates; alums; peroxosulfates (persulfates):
2834
Nitrites; nitrates:
2835
Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined:
2836
Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate:
2837
Cyanides, cyanide oxides and complex cyanides:
2839
Silicates; commercial alkali metal silicates:
2840
Borates; peroxoborates (perborates):
2841
Salts of oxometallic or peroxometallic acids:
2842
Other salts of inorganic acids or peroxoacids (including aluminosilicates whether or not chemically defined), other than azides:
2843
Colloidal precious metals; inorganic or organic compounds of precious metals, whether or not chemically defined; amalgams of precious metals:
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:
2845
Isotopes other than those of heading 2844; compounds, inorganic or organic, of such isotopes, whether or not chemically defined:
2846
Compounds, inorganic or organic, of rare-earth metals, of yttrium or of scandium, or of mixtures of these metals:
2847
Hydrogen peroxide, whether or not solidified with urea
2849
Carbides, whether or not chemically defined:
2850
Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, other than compounds which are also carbides of heading 2849:
2852
Inorganic or organic compounds of mercury, whether or not chemically defined, excluding amalgams:
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:
Recent CBP rulings in Chapter 28
N359642
March 27, 2026
The country of origin of toilet paper
N358853
March 10, 2026
The tariff classification of Aluminum Chlorohydrate from China
N358617
March 6, 2026
The tariff classification of Difluoromethane (CAS No. 75-10-5) and Carbonyl Sulfide (CAS No. 463-58-1) from Japan
N358616
March 4, 2026
The tariff classification of Propylene, Monochlorosilane, and Nitric Oxide from South Korea
N358225
February 19, 2026
The country of origin of toilet paper
N358276
February 19, 2026
The tariff classification and eligibility of the United States-Mexico-Canada Agreement (USMCA) of Helium-3 from Canada
N358288
February 5, 2026
The country of origin of pressure sensors
H354463
February 3, 2026
Ruling Request; U.S. International Trade Commission; General and Limited Exclusion Orders; Investigation No. 337-TA-1364; Certain Blood Flow Restriction Devices with Rotatable Windlasses and Components Thereof
N357936
January 28, 2026
The tariff classification of Tribasic Copper Chloride from Thailand
N357184
January 5, 2026
The tariff classification of Calcium Chloride Dihydrate and Magnesium Chloride Hexahydrate from the Czech Republic
N356320
December 17, 2025
The tariff classification of Rhodium (III) Sulfate from Switzerland
N356350
December 4, 2025
The country of origin of fiber optic cable assemblies
Chapter 28 legal notes →
Section, chapter, additional U.S., and statistical notes that govern classification under Chapter 28.
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