# United States tariff line 2831.10.10.00: Sodium formaldehyde sulfoxylate

> In the United States tariff, line 2831.10.10.00 covers dithionites and sulfoxylates, of sodium, sodium formaldehyde sulfoxylate. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 2831.10 in heading 28.31 (chapter 28).

Source: https://border.bot/countries/united-states/hs-codes/2831101000
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) / [2831.10.10.00](https://border.bot/countries/united-states/hs-codes/2831101000)

## Key facts

- Tariff line: 2831.10.10.00
- Covers: Dithionites and sulfoxylates, of sodium, sodium formaldehyde sulfoxylate
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [2831.10](https://border.bot/hs-codes/283110)

## What this line covers

In the United States tariff, line 2831.10.10.00 covers dithionites and sulfoxylates, of sodium, sodium formaldehyde sulfoxylate.

Its legal text is “Sodium formaldehyde sulfoxylate”, read under “Of sodium”.

## How it is structured

It falls under HS subheading 2831.10 in heading 28.31 (chapter 28). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- 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 sulfoxylates
- Subheading 2831.10: Of sodium
- Line 2831.10.10.00: Sodium formaldehyde sulfoxylate

## Duty

Goods under this line enter free of general (MFN) duty.

## 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)

## Other lines under 2831.10

- [2831.10.50.00](https://border.bot/countries/united-states/hs-codes/2831105000) Other

- Previous line: [2830.90.90.00](https://border.bot/countries/united-states/hs-codes/2830909000) Other
- Next line: [2831.10.50.00](https://border.bot/countries/united-states/hs-codes/2831105000) Other

## Frequently asked questions

### What does tariff line 2831.10.10.00 cover in the United States tariff?

In the United States tariff, line 2831.10.10.00 covers dithionites and sulfoxylates, of sodium, sodium formaldehyde sulfoxylate.

### What is the general (MFN) duty on 2831.10.10.00 in the United States?

Goods under this line enter free of general (MFN) duty.

## 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/2831101000.json