# United States tariff lines under HS 2831.10

> The United States tariff splits HS 2831.10 (dithionites and sulfoxylates, of sodium) into 2 national lines: 2831.10.10.00 (sodium formaldehyde sulfoxylate) and 2831.10.50.00 (other). The general (MFN) duty differs by line: free on 2831.10.10.00 and 5.5% on 2831.10.50.00.

Source: https://border.bot/countries/united-states/hs-codes/283110
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 28](https://border.bot/countries/united-states/hs-codes/28) / [2831.10](https://border.bot/countries/united-states/hs-codes/283110)

## Key facts

- HS subheading: [2831.10](https://border.bot/hs-codes/283110)
- National lines: 2
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 28: Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes

## United States lines under 2831.10

The United States tariff splits HS 2831.10 (dithionites and sulfoxylates, of sodium) into 2 national lines: 2831.10.10.00 (sodium formaldehyde sulfoxylate) and 2831.10.50.00 (other).

The general (MFN) duty differs by line: free on 2831.10.10.00 and 5.5% on 2831.10.50.00.

- [2831.10.10.00](https://border.bot/countries/united-states/hs-codes/2831101000) Of sodium, Sodium formaldehyde sulfoxylate. Duty (MFN): free
- [2831.10.50.00](https://border.bot/countries/united-states/hs-codes/2831105000) Of sodium, Other. Duty (MFN): 5.5%

## In other countries

No other national tariff on border.bot has live lines under 2831.10 yet.

- [The Harmonized System text for 2831.10](https://border.bot/hs-codes/283110)

- Previous subheading: [2830.90](https://border.bot/countries/united-states/hs-codes/283090) Other
- Next subheading: [2831.90](https://border.bot/countries/united-states/hs-codes/283190) Dithionites and sulfoxylates

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 2831.10?

The United States tariff splits HS 2831.10 (dithionites and sulfoxylates, of sodium) into 2 national lines: 2831.10.10.00 (sodium formaldehyde sulfoxylate) and 2831.10.50.00 (other).

### What is the duty on HS 2831.10 in the United States?

The general (MFN) duty differs by line: free on 2831.10.10.00 and 5.5% on 2831.10.50.00.

## Sources and updates

The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

This page was last updated on 9 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.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/283110.json