# HS code 2831.10: Dithionites and sulphoxylates, of sodium

> HS code 2831.10 covers dithionites and sulphoxylates, of sodium. It sits in heading 28.31 (dithionites and sulphoxylates) 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 28.31 are classified under 2831.90 (other). National tariff lines under 2831.10 are live on border.bot for the United States (2 lines, also used by 1 other country).

Source: https://border.bot/hs-codes/283110
Last updated: 11 October 2026

[HS codes](https://border.bot/hs-codes) / [Chapter 28](https://border.bot/hs-codes/28) / [28.31](https://border.bot/hs-codes/2831) / [2831.10](https://border.bot/hs-codes/283110)

## Key facts

- HS code: 2831.10
- Covers: Dithionites and sulphoxylates, of sodium
- Heading: [28.31: Dithionites and sulphoxylates](https://border.bot/hs-codes/2831)
- 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/283110)

## What this code covers

HS code 2831.10 covers dithionites and sulphoxylates, of sodium.

The legal text of the subheading is “Of sodium”, in HS2022.

## What it doesn’t cover

Other goods of heading 28.31 are classified under 2831.90 (other).

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

## How it is structured

2831.10 is a six-digit subheading. Its first two digits, 28, are the chapter; the first four, 2831, are heading 28.31; the last two, 10, 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 28.31: Dithionites and sulphoxylates
- Subheading 2831.10: Of sodium

## In other countries

National tariff lines under 2831.10 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/283110): 2 lines, used by 1 other country

- Previous subheading: [2830.90](https://border.bot/hs-codes/283090) Other
- Next subheading: [2831.90](https://border.bot/hs-codes/283190) Other

## Frequently asked questions

### What does HS code 2831.10 cover?

HS code 2831.10 covers dithionites and sulphoxylates, of sodium.

### Which heading and chapter is HS code 2831.10 in?

HS code 2831.10 is in heading 28.31 (dithionites and sulphoxylates) 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 28.31 classified when 2831.10 doesn’t fit?

Other goods of heading 28.31 are classified under 2831.90 (other).

### Which countries’ tariffs list national lines under HS code 2831.10?

National tariff lines under 2831.10 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/283110.json