HTS Heading 2831

Dithionites and sulfoxylates

All 3 HTS codes under heading 2831 (dithionites and sulfoxylates), with their duty rates from the 2026 HTS Revision 23. General duty Free to 5.5%.

Every line of heading 2831

  • 2831 Dithionites and sulfoxylates.
  • 2831.10 Of sodium (under: Dithionites and sulfoxylates).
  • 2831.10.10.00 Sodium formaldehyde sulfoxylate (kg): General Free; Special none; Column 2 35%.
  • 2831.10.50.00 Other (under: Of sodium) (kg): General 5.5%; Special Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 2831.90.00.00 Other (under: Dithionites and sulfoxylates) (kg): General 5.5%; Special Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.

About these rates

The rates are those printed in the 2026 HTS Revision 23, published by the U.S. International Trade Commission. A 10-digit statistical line takes the rates printed on the 8-digit line above it. Chapter 99 duties (Section 232, Section 301, IEEPA) depend on the product, the origin and the date, are charged on top, and are not included. A code here is a strong lead, not a ruling: confirm it with a customs broker or a CBP binding ruling.

Last reviewed 2026-11-12.