# HS code 2836.40: Potassium carbonates

> HS code 2836.40 covers potassium carbonates. It sits in heading 28.36 (carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate) in chapter 28 (inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes). Other goods of heading 28.36 are classified under 2836.20 (disodium carbonate), 2836.30 (sodium hydrogencarbonate (sodium bicarbonate)), 2836.50 (calcium carbonate), 2836.60 (barium carbonate) or 3 others. National tariff lines under 2836.40 are live on border.bot for the United States (2 lines, also used by 1 other country).

Source: https://border.bot/hs-codes/283640
Last updated: 11 October 2026

[HS codes](https://border.bot/hs-codes) / [Chapter 28](https://border.bot/hs-codes/28) / [28.36](https://border.bot/hs-codes/2836) / [2836.40](https://border.bot/hs-codes/283640)

## Key facts

- HS code: 2836.40
- Covers: Potassium carbonates
- Heading: [28.36: Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate](https://border.bot/hs-codes/2836)
- Chapter: [28: Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes](https://border.bot/hs-codes/28)
- Edition: HS2022
- Duty in the United States: [See its 2 lines](https://border.bot/countries/united-states/hs-codes/283640)

## What this code covers

HS code 2836.40 covers potassium carbonates.

The legal text of the subheading is “Potassium carbonates”, in HS2022.

## What it doesn’t cover

Other goods of heading 28.36 are classified under 2836.20 (disodium carbonate), 2836.30 (sodium hydrogencarbonate (sodium bicarbonate)), 2836.50 (calcium carbonate), 2836.60 (barium carbonate) or 3 others.

- [2836.20](https://border.bot/hs-codes/283620) Disodium carbonate
- [2836.30](https://border.bot/hs-codes/283630) Sodium hydrogencarbonate (sodium bicarbonate)
- [2836.50](https://border.bot/hs-codes/283650) Calcium carbonate
- [2836.60](https://border.bot/hs-codes/283660) Barium carbonate
- [2836.91](https://border.bot/hs-codes/283691) Other: Lithium carbonates
- [2836.92](https://border.bot/hs-codes/283692) Other: Strontium carbonate
- [2836.99](https://border.bot/hs-codes/283699) Other: Other

## How it is structured

2836.40 is a six-digit subheading. Its first two digits, 28, are the chapter; the first four, 2836, are heading 28.36; the last two, 40, identify the subheading within the heading.

Countries add their own digits after these six for their national tariff lines.

- Chapter 28: Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes
- Heading 28.36: Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate
- Subheading 2836.40: Potassium carbonates

## In other countries

National tariff lines under 2836.40 are live on border.bot for the United States (2 lines, also used by 1 other country).

- [United States](https://border.bot/countries/united-states/hs-codes/283640): 2 lines, used by 1 other country

- Previous subheading: [2836.30](https://border.bot/hs-codes/283630) Sodium hydrogencarbonate (sodium bicarbonate)
- Next subheading: [2836.50](https://border.bot/hs-codes/283650) Calcium carbonate

## Frequently asked questions

### What does HS code 2836.40 cover?

HS code 2836.40 covers potassium carbonates.

### Which heading and chapter is HS code 2836.40 in?

HS code 2836.40 is in heading 28.36 (carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate) in chapter 28 (inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes).

### Where are goods of heading 28.36 classified when 2836.40 doesn’t fit?

Other goods of heading 28.36 are classified under 2836.20 (disodium carbonate), 2836.30 (sodium hydrogencarbonate (sodium bicarbonate)), 2836.50 (calcium carbonate), 2836.60 (barium carbonate) or 3 others.

### Which countries’ tariffs list national lines under HS code 2836.40?

National tariff lines under 2836.40 are live on border.bot for the United States (2 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/283640.json