# HS chapter 28: Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes (page 1 of 2)

> HS chapter 28 covers inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or… Page 1 of 2.

Source: https://border.bot/hs-codes/28
Last updated: 11 October 2026

[HS codes](https://border.bot/hs-codes) / [Chapter 28](https://border.bot/hs-codes/28)

Page 1 of 2: subheadings 1 to 100 of 180. Next page: [page 2](https://border.bot/hs-codes/28?page=2).

## Key facts

- Chapter: 28
- Description: Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes
- Headings: 50
- Subheadings: 180
- Edition: HS2022

## What this chapter covers

HS chapter 28 covers inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes.

It has 50 headings, 28.01 to 28.53, and 180 six-digit subheadings in HS2022.

### [28.01](https://border.bot/hs-codes/2801) Fluorine, chlorine, bromine and iodine

- [2801.10](https://border.bot/hs-codes/280110) Chlorine
- [2801.20](https://border.bot/hs-codes/280120) Iodine
- [2801.30](https://border.bot/hs-codes/280130) Fluorine; bromine

### [28.02](https://border.bot/hs-codes/2802) Sulphur, sublimed or precipitated; colloidal sulphur

- [2802.00](https://border.bot/hs-codes/280200) Sulphur, sublimed or precipitated; colloidal sulphur

### [28.03](https://border.bot/hs-codes/2803) Carbon (carbon blacks and other forms of carbon not elsewhere specified or included)

- [2803.00](https://border.bot/hs-codes/280300) Carbon (carbon blacks and other forms of carbon not elsewhere specified or included)

### [28.04](https://border.bot/hs-codes/2804) Hydrogen, rare gases and other non-metals

- [2804.10](https://border.bot/hs-codes/280410) Hydrogen
- [2804.21](https://border.bot/hs-codes/280421) Rare gases: Argon
- [2804.29](https://border.bot/hs-codes/280429) Rare gases: Other
- [2804.30](https://border.bot/hs-codes/280430) Nitrogen
- [2804.40](https://border.bot/hs-codes/280440) Oxygen
- [2804.50](https://border.bot/hs-codes/280450) Boron; tellurium
- [2804.61](https://border.bot/hs-codes/280461) Silicon: Containing by weight not less than 99.99 % of silicon
- [2804.69](https://border.bot/hs-codes/280469) Silicon: Other
- [2804.70](https://border.bot/hs-codes/280470) Phosphorus
- [2804.80](https://border.bot/hs-codes/280480) Arsenic
- [2804.90](https://border.bot/hs-codes/280490) Selenium

### [28.05](https://border.bot/hs-codes/2805) Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed; mercury

- [2805.11](https://border.bot/hs-codes/280511) Alkali or alkaline-earth metals: Sodium
- [2805.12](https://border.bot/hs-codes/280512) Alkali or alkaline-earth metals: Calcium
- [2805.19](https://border.bot/hs-codes/280519) Alkali or alkaline-earth metals: Other
- [2805.30](https://border.bot/hs-codes/280530) Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed
- [2805.40](https://border.bot/hs-codes/280540) Mercury

### [28.06](https://border.bot/hs-codes/2806) Hydrogen chloride (hydrochloric acid); chlorosulphuric acid

- [2806.10](https://border.bot/hs-codes/280610) Hydrogen chloride (hydrochloric acid)
- [2806.20](https://border.bot/hs-codes/280620) Chlorosulphuric acid

### [28.07](https://border.bot/hs-codes/2807) Sulphuric acid; oleum

- [2807.00](https://border.bot/hs-codes/280700) Sulphuric acid; oleum

### [28.08](https://border.bot/hs-codes/2808) Nitric acid; sulphonitric acids

- [2808.00](https://border.bot/hs-codes/280800) Nitric acid; sulphonitric acids

### [28.09](https://border.bot/hs-codes/2809) Diphosphorus pentaoxide; phosphoric acid; polyphosphoric acids, whether or not chemically defined

- [2809.10](https://border.bot/hs-codes/280910) Diphosphorus pentaoxide
- [2809.20](https://border.bot/hs-codes/280920) Phosphoric acid and polyphosphoric acids

### [28.10](https://border.bot/hs-codes/2810) Oxides of boron; boric acids

- [2810.00](https://border.bot/hs-codes/281000) Oxides of boron; boric acids

### [28.11](https://border.bot/hs-codes/2811) Other inorganic acids and other inorganic oxygen compounds of non-metals

- [2811.11](https://border.bot/hs-codes/281111) Other inorganic acids: Hydrogen fluoride (hydrofluoric acid)
- [2811.12](https://border.bot/hs-codes/281112) Other inorganic acids: Hydrogen cyanide (hydrocyanic acid)
- [2811.19](https://border.bot/hs-codes/281119) Other inorganic acids: Other
- [2811.21](https://border.bot/hs-codes/281121) Other inorganic oxygen compounds of non-metals: Carbon dioxide
- [2811.22](https://border.bot/hs-codes/281122) Other inorganic oxygen compounds of non-metals: Silicon dioxide
- [2811.29](https://border.bot/hs-codes/281129) Other inorganic oxygen compounds of non-metals: Other

### [28.12](https://border.bot/hs-codes/2812) Halides and halide oxides of non-metals

- [2812.11](https://border.bot/hs-codes/281211) Chlorides and chloride oxides: Carbonyl dichloride (phosgene)
- [2812.12](https://border.bot/hs-codes/281212) Chlorides and chloride oxides: Phosphorus oxychloride
- [2812.13](https://border.bot/hs-codes/281213) Chlorides and chloride oxides: Phosphorus trichloride
- [2812.14](https://border.bot/hs-codes/281214) Chlorides and chloride oxides: Phosphorus pentachloride
- [2812.15](https://border.bot/hs-codes/281215) Chlorides and chloride oxides: Sulphur monochloride
- [2812.16](https://border.bot/hs-codes/281216) Chlorides and chloride oxides: Sulphur dichloride
- [2812.17](https://border.bot/hs-codes/281217) Chlorides and chloride oxides: Thionyl chloride
- [2812.19](https://border.bot/hs-codes/281219) Chlorides and chloride oxides: Other
- [2812.90](https://border.bot/hs-codes/281290) Other

### [28.13](https://border.bot/hs-codes/2813) Sulphides of non-metals; commercial phosphorus trisulphide

- [2813.10](https://border.bot/hs-codes/281310) Carbon disulphide
- [2813.90](https://border.bot/hs-codes/281390) Other

### [28.14](https://border.bot/hs-codes/2814) Ammonia, anhydrous or in aqueous solution

- [2814.10](https://border.bot/hs-codes/281410) Anhydrous ammonia
- [2814.20](https://border.bot/hs-codes/281420) Ammonia in aqueous solution

### [28.15](https://border.bot/hs-codes/2815) Sodium hydroxide (caustic soda); potassium hydroxide (caustic potash); peroxides of sodium or potassium

- [2815.11](https://border.bot/hs-codes/281511) Sodium hydroxide (caustic soda): Solid
- [2815.12](https://border.bot/hs-codes/281512) Sodium hydroxide (caustic soda): In aqueous solution (soda lye or liquid soda)
- [2815.20](https://border.bot/hs-codes/281520) Potassium hydroxide (caustic potash)
- [2815.30](https://border.bot/hs-codes/281530) Peroxides of sodium or potassium

### [28.16](https://border.bot/hs-codes/2816) Hydroxide and peroxide of magnesium; oxides, hydroxides and peroxides, of strontium or barium

- [2816.10](https://border.bot/hs-codes/281610) Hydroxide and peroxide of magnesium
- [2816.40](https://border.bot/hs-codes/281640) Oxides, hydroxides and peroxides, of strontium or barium

### [28.17](https://border.bot/hs-codes/2817) Zinc oxide; zinc peroxide

- [2817.00](https://border.bot/hs-codes/281700) Zinc oxide; zinc peroxide

### [28.18](https://border.bot/hs-codes/2818) Artificial corundum, whether or not chemically defined; aluminium oxide; aluminium hydroxide

- [2818.10](https://border.bot/hs-codes/281810) Artificial corundum, whether or not chemically defined
- [2818.20](https://border.bot/hs-codes/281820) Aluminium oxide, other than artificial corundum
- [2818.30](https://border.bot/hs-codes/281830) Aluminium hydroxide

### [28.19](https://border.bot/hs-codes/2819) Chromium oxides and hydroxides

- [2819.10](https://border.bot/hs-codes/281910) Chromium trioxide
- [2819.90](https://border.bot/hs-codes/281990) Other

### [28.20](https://border.bot/hs-codes/2820) Manganese oxides

- [2820.10](https://border.bot/hs-codes/282010) Manganese dioxide
- [2820.90](https://border.bot/hs-codes/282090) Other

### [28.21](https://border.bot/hs-codes/2821) Iron oxides and hydroxides; earth colours containing 70 % or more by weight of combined iron evaluated as Fe2O3

- [2821.10](https://border.bot/hs-codes/282110) Iron oxides and hydroxides
- [2821.20](https://border.bot/hs-codes/282120) Earth colours

### [28.22](https://border.bot/hs-codes/2822) Cobalt oxides and hydroxides; commercial cobalt oxides

- [2822.00](https://border.bot/hs-codes/282200) Cobalt oxides and hydroxides; commercial cobalt oxides

### [28.23](https://border.bot/hs-codes/2823) Titanium oxides

- [2823.00](https://border.bot/hs-codes/282300) Titanium oxides

### [28.24](https://border.bot/hs-codes/2824) Lead oxides; red lead and orange lead

- [2824.10](https://border.bot/hs-codes/282410) Lead monoxide (litharge, massicot)
- [2824.90](https://border.bot/hs-codes/282490) Other

### [28.25](https://border.bot/hs-codes/2825) Hydrazine and hydroxylamine and their inorganic salts; other inorganic bases; other metal oxides, hydroxides and peroxides

- [2825.10](https://border.bot/hs-codes/282510) Hydrazine and hydroxylamine and their inorganic salts
- [2825.20](https://border.bot/hs-codes/282520) Lithium oxide and hydroxide
- [2825.30](https://border.bot/hs-codes/282530) Vanadium oxides and hydroxides
- [2825.40](https://border.bot/hs-codes/282540) Nickel oxides and hydroxides
- [2825.50](https://border.bot/hs-codes/282550) Copper oxides and hydroxides
- [2825.60](https://border.bot/hs-codes/282560) Germanium oxides and zirconium dioxide
- [2825.70](https://border.bot/hs-codes/282570) Molybdenum oxides and hydroxides
- [2825.80](https://border.bot/hs-codes/282580) Antimony oxides
- [2825.90](https://border.bot/hs-codes/282590) Other

### [28.26](https://border.bot/hs-codes/2826) Fluorides; fluorosilicates, fluoroaluminates and other complex fluorine salts

- [2826.12](https://border.bot/hs-codes/282612) Fluorides: Of aluminium
- [2826.19](https://border.bot/hs-codes/282619) Fluorides: Other
- [2826.30](https://border.bot/hs-codes/282630) Sodium hexafluoroaluminate (synthetic cryolite)
- [2826.90](https://border.bot/hs-codes/282690) Other

### [28.27](https://border.bot/hs-codes/2827) Chlorides, chloride oxides and chloride hydroxides; bromides and bromide oxides; iodides and iodide oxides

- [2827.10](https://border.bot/hs-codes/282710) Ammonium chloride
- [2827.20](https://border.bot/hs-codes/282720) Calcium chloride
- [2827.31](https://border.bot/hs-codes/282731) Other chlorides: Of magnesium
- [2827.32](https://border.bot/hs-codes/282732) Other chlorides: Of aluminium
- [2827.35](https://border.bot/hs-codes/282735) Other chlorides: Of nickel
- [2827.39](https://border.bot/hs-codes/282739) Other chlorides: Other
- [2827.41](https://border.bot/hs-codes/282741) Chloride oxides and chloride hydroxides: Of copper
- [2827.49](https://border.bot/hs-codes/282749) Chloride oxides and chloride hydroxides: Other
- [2827.51](https://border.bot/hs-codes/282751) Bromides and bromide oxides: Bromides of sodium or of potassium
- [2827.59](https://border.bot/hs-codes/282759) Bromides and bromide oxides: Other
- [2827.60](https://border.bot/hs-codes/282760) Iodides and iodide oxides

### [28.28](https://border.bot/hs-codes/2828) Hypochlorites; commercial calcium hypochlorite; chlorites; hypobromites

- [2828.10](https://border.bot/hs-codes/282810) Commercial calcium hypochlorite and other calcium hypochlorites
- [2828.90](https://border.bot/hs-codes/282890) Other

### [28.29](https://border.bot/hs-codes/2829) Chlorates and perchlorates; bromates and perbromates; iodates and periodates

- [2829.11](https://border.bot/hs-codes/282911) Chlorates: Of sodium
- [2829.19](https://border.bot/hs-codes/282919) Chlorates: Other
- [2829.90](https://border.bot/hs-codes/282990) Other

### [28.30](https://border.bot/hs-codes/2830) Sulphides; polysulphides, whether or not chemically defined

- [2830.10](https://border.bot/hs-codes/283010) Sodium sulphides
- [2830.90](https://border.bot/hs-codes/283090) Other

### [28.31](https://border.bot/hs-codes/2831) Dithionites and sulphoxylates

- [2831.10](https://border.bot/hs-codes/283110) Of sodium
- [2831.90](https://border.bot/hs-codes/283190) Other


## What it doesn’t cover

Chapter 27, before it, covers mineral fuels, mineral oils and products of their distillation; bituminous substances; mineral waxes; chapter 29, after it, covers organic chemicals.

## How it is structured

Chapter 28 is the first level of the Harmonized System. Its headings add two digits to the chapter number (28.01), and each heading's subheadings add two more.

## In other countries

National tariff lines under chapter 28 are live on border.bot for the United States (336 lines, also used by 1 other country).

- [United States](https://border.bot/countries/united-states/hs-codes/28): 336 lines, used by 1 other country

Page 1 of 2: subheadings 1 to 100 of 180. Next page: [page 2](https://border.bot/hs-codes/28?page=2).

- Previous chapter: [27](https://border.bot/hs-codes/27) Mineral fuels, mineral oils and products of their distillation; bituminous substances; mineral waxes
- Next chapter: [29](https://border.bot/hs-codes/29) Organic chemicals

## Frequently asked questions

### What does HS chapter 28 cover?

HS chapter 28 covers inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes.

### How many headings and subheadings are in HS chapter 28?

HS chapter 28 has 50 headings and 180 six-digit subheadings in HS2022.

### Which countries’ tariffs list national lines in HS chapter 28?

National tariff lines under chapter 28 are live on border.bot for the United States (336 lines, also used by 1 other country).

## Sources and updates

The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026.

This page was last updated on 11 October 2026.

Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.

Machine-readable: https://border.bot/hs-codes/28.json