# HS heading 28.33: Sulphates; alums; peroxosulphates (persulphates)

> HS heading 28.33 covers sulphates; alums; peroxosulphates (persulphates). It is in chapter 28 (inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes). It is split into 10 subheadings: 2833.11 (sodium sulphates, disodium sulphate), 2833.19 (sodium sulphates, other), 2833.21 (other sulphates, of magnesium), 2833.22 (other sulphates, of aluminium), 2833.24 (other sulphates, of nickel), 2833.25 (other sulphates, of copper) and 4 others. National tariff lines under heading 28.33 are live on border.bot for the United States (21 lines, also used by 1 other country).

Source: https://border.bot/hs-codes/2833
Last updated: 11 October 2026

[HS codes](https://border.bot/hs-codes) / [Chapter 28](https://border.bot/hs-codes/28) / [28.33](https://border.bot/hs-codes/2833)

## Key facts

- Heading: 28.33
- Description: Sulphates; alums; peroxosulphates (persulphates)
- Chapter: 28: Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes
- Subheadings: 10
- Edition: HS2022

## What this code covers

HS heading 28.33 covers sulphates; alums; peroxosulphates (persulphates).

It is split into 10 subheadings: 2833.11 (sodium sulphates, disodium sulphate), 2833.19 (sodium sulphates, other), 2833.21 (other sulphates, of magnesium), 2833.22 (other sulphates, of aluminium), 2833.24 (other sulphates, of nickel), 2833.25 (other sulphates, of copper) and 4 others.

- [2833.11](https://border.bot/hs-codes/283311) Sodium sulphates: Disodium sulphate
- [2833.19](https://border.bot/hs-codes/283319) Sodium sulphates: Other
- [2833.21](https://border.bot/hs-codes/283321) Other sulphates: Of magnesium
- [2833.22](https://border.bot/hs-codes/283322) Other sulphates: Of aluminium
- [2833.24](https://border.bot/hs-codes/283324) Other sulphates: Of nickel
- [2833.25](https://border.bot/hs-codes/283325) Other sulphates: Of copper
- [2833.27](https://border.bot/hs-codes/283327) Other sulphates: Of barium
- [2833.29](https://border.bot/hs-codes/283329) Other sulphates: Other
- [2833.30](https://border.bot/hs-codes/283330) Alums
- [2833.40](https://border.bot/hs-codes/283340) Peroxosulphates (persulphates)

## What it doesn’t cover

Other goods of chapter 28 are classified in its other 49 headings, listed below.

- [28.01](https://border.bot/hs-codes/2801) Fluorine, chlorine, bromine and iodine
- [28.02](https://border.bot/hs-codes/2802) 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)
- [28.04](https://border.bot/hs-codes/2804) Hydrogen, rare gases and other non-metals
- [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
- [28.06](https://border.bot/hs-codes/2806) Hydrogen chloride (hydrochloric acid); chlorosulphuric acid
- [28.07](https://border.bot/hs-codes/2807) Sulphuric acid; oleum
- [28.08](https://border.bot/hs-codes/2808) Nitric acid; sulphonitric acids
- [28.09](https://border.bot/hs-codes/2809) Diphosphorus pentaoxide; phosphoric acid; polyphosphoric acids, whether or not chemically defined
- [28.10](https://border.bot/hs-codes/2810) Oxides of boron; boric acids
- [28.11](https://border.bot/hs-codes/2811) Other inorganic acids and other inorganic oxygen compounds of non-metals
- [28.12](https://border.bot/hs-codes/2812) Halides and halide oxides of non-metals
- [28.13](https://border.bot/hs-codes/2813) Sulphides of non-metals; commercial phosphorus trisulphide
- [28.14](https://border.bot/hs-codes/2814) Ammonia, anhydrous or in aqueous solution
- [28.15](https://border.bot/hs-codes/2815) Sodium hydroxide (caustic soda); potassium hydroxide (caustic potash); 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
- [28.17](https://border.bot/hs-codes/2817) Zinc oxide; zinc peroxide
- [28.18](https://border.bot/hs-codes/2818) Artificial corundum, whether or not chemically defined; aluminium oxide; aluminium hydroxide
- [28.19](https://border.bot/hs-codes/2819) Chromium oxides and hydroxides
- [28.20](https://border.bot/hs-codes/2820) Manganese oxides
- [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
- [28.22](https://border.bot/hs-codes/2822) Cobalt oxides and hydroxides; commercial cobalt oxides
- [28.23](https://border.bot/hs-codes/2823) Titanium oxides
- [28.24](https://border.bot/hs-codes/2824) Lead oxides; red lead and orange lead
- [28.25](https://border.bot/hs-codes/2825) Hydrazine and hydroxylamine and their inorganic salts; other inorganic bases; other metal oxides, hydroxides and peroxides
- [28.26](https://border.bot/hs-codes/2826) Fluorides; fluorosilicates, fluoroaluminates and other complex fluorine salts
- [28.27](https://border.bot/hs-codes/2827) Chlorides, chloride oxides and chloride hydroxides; bromides and bromide oxides; iodides and iodide oxides
- [28.28](https://border.bot/hs-codes/2828) Hypochlorites; commercial calcium hypochlorite; chlorites; hypobromites
- [28.29](https://border.bot/hs-codes/2829) Chlorates and perchlorates; bromates and perbromates; iodates and periodates
- [28.30](https://border.bot/hs-codes/2830) Sulphides; polysulphides, whether or not chemically defined
- [28.31](https://border.bot/hs-codes/2831) Dithionites and sulphoxylates
- [28.32](https://border.bot/hs-codes/2832) Sulphites; thiosulphates
- [28.34](https://border.bot/hs-codes/2834) Nitrites; nitrates
- [28.35](https://border.bot/hs-codes/2835) Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined
- [28.36](https://border.bot/hs-codes/2836) Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate
- [28.37](https://border.bot/hs-codes/2837) Cyanides, cyanide oxides and complex cyanides
- [28.39](https://border.bot/hs-codes/2839) Silicates; commercial alkali metal silicates
- [28.40](https://border.bot/hs-codes/2840) Borates; peroxoborates (perborates)
- [28.41](https://border.bot/hs-codes/2841) Salts of oxometallic or peroxometallic acids
- [28.42](https://border.bot/hs-codes/2842) Other salts of inorganic acids or peroxoacids (including aluminosilicates whether or not chemically defined), other than azides
- [28.43](https://border.bot/hs-codes/2843) Colloidal precious metals; inorganic or organic compounds of precious metals, whether or not chemically defined; amalgams of precious metals
- [28.44](https://border.bot/hs-codes/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
- [28.45](https://border.bot/hs-codes/2845) Isotopes other than those of heading 28.44; compounds, inorganic or organic, of such isotopes, whether or not chemically defined
- [28.46](https://border.bot/hs-codes/2846) Compounds, inorganic or organic, of rare-earth metals, of yttrium or of scandium or of mixtures of these metals
- [28.47](https://border.bot/hs-codes/2847) Hydrogen peroxide, whether or not solidified with urea
- [28.49](https://border.bot/hs-codes/2849) Carbides, whether or not chemically defined
- [28.50](https://border.bot/hs-codes/2850) Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, other than compounds which are also carbides of heading 28.49
- [28.52](https://border.bot/hs-codes/2852) Inorganic or organic compounds of mercury, whether or not chemically defined, excluding amalgams
- [28.53](https://border.bot/hs-codes/2853) Phosphides, whether or not chemically defined, excluding ferrophosphorus; 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

## How it is structured

Heading 28.33 is one of 50 headings in chapter 28. Its first two digits, 28, are the chapter; the next two, 33, number the heading within it. Its subheadings add two more digits (2833.11, 2833.19, 2833.21).

## In other countries

National tariff lines under heading 28.33 are live on border.bot for the United States (21 lines, also used by 1 other country).

- [United States](https://border.bot/countries/united-states/hs-codes/28): 21 lines, used by 1 other country

- Previous heading: [28.32](https://border.bot/hs-codes/2832) Sulphites; thiosulphates
- Next heading: [28.34](https://border.bot/hs-codes/2834) Nitrites; nitrates

## Frequently asked questions

### What does HS heading 28.33 cover?

HS heading 28.33 covers sulphates; alums; peroxosulphates (persulphates).

### Which chapter is HS heading 28.33 in?

HS heading 28.33 is in chapter 28 (inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes).

### How many subheadings does HS heading 28.33 have?

HS heading 28.33 has 10 subheadings: 2833.11 (sodium sulphates, disodium sulphate), 2833.19 (sodium sulphates, other), 2833.21 (other sulphates, of magnesium), 2833.22 (other sulphates, of aluminium), 2833.24 (other sulphates, of nickel), 2833.25 (other sulphates, of copper) and 4 others.

### Which countries’ tariffs list national lines under HS heading 28.33?

National tariff lines under heading 28.33 are live on border.bot for the United States (21 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/2833.json