Heading 2831: Dithionites and sulfoxylates
Every line of heading 2831 in the U.S. Harmonized Tariff Schedule, with its general (column 1) duty rate. Open a code for the landed cost calculator, trade agreement rates and email alerts if the rate changes.
Dithionites and sulfoxylates
Chapter 28: Inorganic chemicals. Schedule checked on November 8, 2026.
Not always the total: additional chapter 99 duties (such as Section 232 or Section 301), antidumping or countervailing duties may apply depending on the country of origin. See recent chapter 99 changes →
Tariff lines
| HTS code | Official description | General rate |
|---|---|---|
| 2831.10 | Of sodium: | |
| 2831.10.10.00 | Sodium formaldehyde sulfoxylate | Free |
| 2831.10.50.00 | Other | 5.5% |
| 2831.90.00.00 | Other | 5.5% |
Exporting this product from the U.S.?
Exports are reported with Schedule B numbers. Heading 2831 has 3 of them. Schedule B lookup →
- 2831.10.1000SODIUM FORMALDEHYDE SULFOXYLATE
- 2831.10.5000DITHIONITES AND SULFOXYLATES OF SODIUM, NESOI
- 2831.90.0000DITHIONITES AND SULFOXYLATES, EXCEPT OF SODIUM, NESOI
Source: U.S. International Trade Commission, Harmonized Tariff Schedule; Schedule B: U.S. Census Bureau. Information only, not legal or customs advice; U.S. Customs and Border Protection decides the classification and the duty. Confirm with a licensed customs broker before you ship.
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