What does HTS Chapter 28 cover?

Chapter 28 of the U.S. Harmonized Tariff Schedule (HTSUS) covers Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes. It sits within Section VI: Products of the Chemical or Allied Industries. Tandom's catalog lists all 346 10-digit statistical lines and 40 4-digit headings in this chapter.

What is the typical U.S. duty rate for Chapter 28 imports?

General (Column 1) duty rates for ad-valorem lines range from 0.1% to 5.5% (median 3.7%); roughly 30% of lines enter duty-free. Use the calculator linked from each code page to build a date- and origin-specific import-duty estimate, including applicable Chapter 99 layers and customs fees. Potential AD/CVD exposure is flagged separately and is not included in the estimate.

How are Section 301 and Section 232 measures represented in the HTSUS?

Section 301 and Section 232 measures are represented by Chapter 99 provisions. A catalog link between a provision and a 10-digit line is a screening flag, not a claim that the measure applies; origin, product and material facts, claims, and entry date control the result.

How do I screen for antidumping or countervailing duty (AD/CVD) when using Chapter 28?

AD/CVD orders are issued at the case level by the Department of Commerce against specific products from specific countries. Use the product's base HTS code to find potentially relevant AD/CVD order flags, then read the written order scope; an HTS match alone does not determine coverage.

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Section VI: Products of the Chemical or Allied Industries

Chapter 28: Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes

Chapter 28 of the U.S. Harmonized Tariff Schedule covers Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes and sits within Section VI: Products of the Chemical or Allied Industries.

About Chapter 28

Chapter 28 contains 346 10-digit statistical lines grouped under 40 4-digit headings. Brokers, importers, and customs counsel use these codes to declare inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes on entry summaries (CBP Form 7501) and to look up the published Column 1, Special, and Column 2 rate notation.

General (Column 1) duty rates for ad-valorem lines in Chapter 28 range from 0.1% to 5.5%, with a median of 3.7%. About 29% of the chapter's lines (99 of 346) enter duty-free under the general rate. Special-rate notation (including USMCA, KORUS, AGOA, and GSP when authorized) and Chapter 99 measures can modify these base rates for qualifying shipments.

Product-code pages link into the Tandom Tariff Calculator with the base HTS code prefilled. Chapter 99 provision pages instead show mapped base codes and send you to a dated calculator scenario, which determines whether a measure applies from the entry facts. Tandom's data refreshes daily from USITC HTSUS, CBP CSMS, the Federal Register, and the Department of Commerce — the same authoritative sources the trade community files against.

Code	Description	General	Column 2	Special	Units
2801.10.00.00	Chlorine	Free	25%	—	kg
2801.20.00.00	Iodine	Free	Free	—	kg
2801.30	Fluorine; bromine:	—	—	—	—
2801.30.10.00	·Fluorine	3.7%	25%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2801.30.20.00	·Bromine	5.5%	37%	Free (A+,AU,BH,CL,CO,D,E,IL, JO,KR,MA, OM,P,PA,PE,S, SG)	kg

Code	Description	General	Column 2	Special	Units
2803.00.00	Carbon (carbon blacks and other forms of carbon not elsewhere specified or included)	Free	20%	—	—
2803.00.00.10	Carbon black	—	—

Code	Description	General	Column 2	Special	Units
2804.10.00.00	Hydrogen	3.7%	25%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	thousand m3
2804.21.00.00	·Argon	3.7%	25%

Code	Description	General	Column 2	Special	Units
2805.11.00.00	·Sodium	5.3%	25%	Free (A+,AU,BH,CL,CO,D,E,IL, JO,KR,MA, OM,P, PA,PE,S,SG)	kg
2805.12.00.00	·Calcium	3%

Code	Description	General	Column 2	Special	Units
2806.10.00.00	Hydrogen chloride (Hydrochloric acid)	Free	Free	—	t
2806.20.00.00	Chlorosulfuric acid	4.2%	25%

Code	Description	General	Column 2	Special	Units
2808.00.00	Nitric acid; sulfonitric acids	Free	Free	—	—
2808.00.00.10	Nitric acid	—	—	—

Code	Description	General	Column 2	Special	Units
2809.10.00.00	Diphosphorus pentaoxide	Free	25%	—	kg
2809.20.00	Phosphoric acid and polyphosphoric acids	Free	Free

Code	Description	General	Column 2	Special	Units
2811.11.00.00	·Hydrogen fluoride (Hydrofluoric acid)	Free	Free	—	kg
2811.12.00.00	·Hydrogen cyanide (hydrocyanic acid)	4.2%

Code	Description	General	Column 2	Special	Units
2812.11.00.00	·Carbonyl dichloride (phosgene)	3.7%	25%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2812.12.00.00	·Phosphorous oxychloride	3.7%

Code	Description	General	Column 2	Special	Units
2813.10.00.00	Carbon disulfide	3.7%	25%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2813.90	Other:	—	—

Code	Description	General	Column 2	Special	Units
2814.10.00.00	Anhydrous ammonia	Free	Free	—	t
2814.20.00.00	Ammonia in aqueous solution	Free	Free

Code	Description	General	Column 2	Special	Units
2815.11.00.00	·Solid	Free	1.1¢/kg	—	kg
2815.12.00.00	·In aqueous solution (Soda lye or liquid soda)	Free

Code	Description	General	Column 2	Special	Units
2816.10.00.00	Hydroxide and peroxide of magnesium	3.1%	25%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2816.40	Oxides, hydroxides and peroxides, of strontium or barium:	—

Code	Description	General	Column 2	Special	Units
2818.10	Artificial corundum, whether or not chemically defined:	—	—	—	—
2818.10.10.00	·Crude	Free	Free

Code	Description	General	Column 2	Special	Units
2819.10.00.00	Chromium trioxide	3.7%	25%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2819.90.00.00	Other	3.7%	25%

Code	Description	General	Column 2	Special	Units
2822.00.00	Cobalt oxides and hydroxides; commercial cobalt oxides	0.1%	1.7%	Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	—
2822.00.00.00	Cobalt oxides and hydroxides; commercial cobalt oxides	0.1%

Code	Description	General	Column 2	Special	Units
2836.20.00.00	Disodium carbonate	1.2%	8.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2836.30.00.00	Sodium hydrogencarbonate (Sodium bicarbonate)	Free

Code	Description	General	Column 2	Special	Units
2820.10.00.00	Manganese dioxide	4.7%	25%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2820.90.00.00	Other	4.7%	25%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)

Code	Description	General	Column 2	Special	Units
2821.10.00	Iron oxides and hydroxides	3.7%	25%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	—
2821.10.00.10	··Black	3.7%

Code	Description	General	Column 2	Special	Units
2824.10.00.00	Lead monoxide (litharge, massicot)	3%	12%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2824.90	Other:	—	—

Code	Description	General	Column 2	Special	Units
2825.10.00.00	Hydrazine and hydroxylamine and their inorganic salts	3.7%	25%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2825.20.00.00	Lithium oxide and hydroxide	3.7%

Code	Description	General	Column 2	Special	Units
2827.10.00.00	Ammonium chloride	2.9%	18%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2827.20.00.00	Calcium chloride	Free	Free

Code	Description	General	Column 2	Special	Units
2828.10.00.00	Commercial calcium hypochlorite and other calcium hypochlorites	2.4%	25%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2828.90.00.00	Other	3.7%

Code	Description	General	Column 2	Special	Units
2829.11.00.00	·Of sodium	Free	13%	—	kg
2829.19.01.00	·Other	3.3%	25%

Code	Description	General	Column 2	Special	Units
2830.10.00.00	Sodium sulfides	3.7%	25%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2830.90	Other:	—	—

Code	Description	General	Column 2	Special	Units
2831.10	Of sodium:	—	—	—	—
2831.10.10.00	·Sodium formaldehyde sulfoxylate	Free	35%

Code	Description	General	Column 2	Special	Units
2832.10.00.00	Sodium sulfites	1.5%	4.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2832.20.00.00	Other sulfites	3.1%	25%

2801Fluorine, chlorine, bromine and iodine:

2802Sulfur, sublimed or precipitated; colloidal sulfur

2803

2804Hydrogen, rare gases and other nonmetals:

2805Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed; mercury:

2806Hydrogen chloride (Hydrochloric acid); chlorosulfuric acid:

2807Sulfuric acid; oleum

2808

2809Diphosphorus pentaoxide; phosphoric acid;polyphosphoric acids, whether or not chemically defined:

2810Oxides of boron; boric acids

2811Other inorganic acids and other inorganic oxygen compounds of nonmetals:

2812Halides and halide oxides of nonmetals:

2813Sulfides of nonmetals; commercial phosphorus trisulfide:

2814Ammonia, anhydrous or in aqueous solution:

2815Sodium hydroxide (Caustic soda); potassium hydroxide (Caustic potash); peroxides of sodium or potassium:

2816Hydroxide and peroxide of magnesium; oxides, hydroxides and peroxides, of strontium or barium:

2817Zinc oxide; zinc peroxide

2818Artificial corundum, whether or not chemically defined; aluminum oxide; aluminum hydroxide:

2819Chromium oxides and hydroxides:

2820Manganese oxides:

2821Iron oxides and hydroxides; earth colors containing 70 percent or more by weight of combined iron evaluated as Fe2O3:

2822

2823Titanium oxides

2824Lead oxides; red lead and orange lead:

2825Hydrazine and hydroxylamine and their inorganic salts; other inorganic bases; other metal oxides, hydroxides and peroxides:

2826Fluorides; fluorosilicates, fluoroaluminates and other complex fluorine salts:

2827Chlorides, chloride oxides and chloride hydroxides; bromides and bromide oxides; iodides and iodide oxides:

2828Hypochlorites; commercial calcium hypochlorite; chlorites; hypobromites:

2829Chlorates and perchlorates; bromates and perbromates; iodates and periodates:

2830Sulfides; polysulfides, whether or not chemically defined:

2831Dithionites and sulfoxylates:

2832Sulfites; thiosulfates:

2833Sulfates; alums; peroxosulfates (persulfates):

2834Nitrites; nitrates:

2835Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined:

2836Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate:

2837Cyanides, cyanide oxides and complex cyanides:

2839Silicates; commercial alkali metal silicates:

2840Borates; peroxoborates (perborates):

2841Salts of oxometallic or peroxometallic acids:

2842Other salts of inorganic acids or peroxoacids (including aluminosilicates whether or not chemically defined), other than azides:

2843Colloidal precious metals; inorganic or organic compounds of precious metals, whether or not chemically defined; amalgams of precious metals:

2844Radioactive chemical elements and radioactive isotopes (including the fissile or fertile chemical elements and isotopes) and their compounds; mixtures and residues containing these products:

2845Isotopes other than those of heading 2844; compounds, inorganic or organic, of such isotopes, whether or not chemically defined:

2846Compounds, inorganic or organic, of rare-earth metals, of yttrium or of scandium, or of mixtures of these metals:

2847Hydrogen peroxide, whether or not solidified with urea

2849Carbides, whether or not chemically defined:

2850

2852Inorganic or organic compounds of mercury, whether or not chemically defined, excluding amalgams:

Frequently asked questions

What does HTS Chapter 28 cover?

What is the typical U.S. duty rate for Chapter 28 imports?

How are Section 301 and Section 232 measures represented in the HTSUS?

How do I screen for antidumping or countervailing duty (AD/CVD) when using Chapter 28?

`2801`Fluorine, chlorine, bromine and iodine:

`2802`Sulfur, sublimed or precipitated; colloidal sulfur

`2803`

`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`

`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`

`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`

`2852`Inorganic or organic compounds of mercury, whether or not chemically defined, excluding amalgams:

Code	Description	General	Column 2	Special	Units
2833.11	·Disodium sulfate:	—	—	—	—
2833.11.10.00	··Salt cake	Free	Free

Code	Description	General	Column 2	Special	Units
2834.10	Nitrites:	—	—	—	—
2834.10.10.00	·Of sodium	5.5%	54%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)

Code	Description	General	Column 2	Special	Units
2835.10.00.00	Phosphinates (hypophosphites) and phosphonates (phosphites)	3.1%	25%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2835.22.00.00	·Of mono- or disodium

Code	Description	General	Column 2	Special	Units
2837.11.00.00	·Of sodium	Free	Free	—	kg
2837.19.01	·Other	Free	Free

Code	Description	General	Column 2	Special	Units
2839.11.00.00	·Sodium metasilicates	1.1%	3%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2839.19.00.00	·Other	1.1%	3%

Code	Description	General	Column 2	Special	Units
2840.11.00.00	·Anhydrous	0.3%	1.2%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2840.19.00.00	·Other	0.1%	0.4%

Code	Description	General	Column 2	Special	Units
2841.30.00.00	Sodium dichromate	2.4%	8.5%	Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	kg
2841.50	Other chromates and dichromates; peroxochromates:	—	—

Code	Description	General	Column 2	Special	Units
2842.10.00.00	Double or complex silicates, including aluminosilicates whether or not chemically defined	3.7%	25%	Free (A+,AU,BH,CL,CO,D,E,IL, JO,K,KR,MA,OM,P, PA,PE,S,SG)	kg
2842.90	Other:	—

Code	Description	General	Column 2	Special	Units
2843.10.00.00	Colloidal precious metals	5.5%	65%	Free (A+,AU,BH,CL,CO,D,E,IL, JO,KR,MA, OM,P, PA,PE,S,SG)	g
2843.21.00.00	·Silver nitrate	3.7%

Code	Description	General	Column 2	Special	Units
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