Section VI · Organic chemicals

2904.32

Ammonium perfluorooctane sulfonate

How this code is built
29

Chapter

Organic chemicals

04

Heading

The product family within the chapter

32

Subheading

The specific good, identical worldwide

The first six digits are the same in every country that uses the Harmonized System. The United States adds two more for the tariff rate and, often, two more for statistics — which is why the rates below are listed against 8- and 10-digit numbers rather than against this code.

How the schedule reaches this code

  1. 29Organic chemicals
  2. 2904Sulfonated, nitrated or nitrosated derivatives of hydrocarbons, whether or not halogenated:
  3. Perfluorooctane sulfonic acid, its salts and perfluorooctane sulfonyl fluoride:
  4. Ammonium perfluorooctane sulfonate

Published US duty rates

Duty is set at the 8- or 10-digit line, not at this 6-digit subheading, so more than one rate can sit under this code.

  • 2904.32.00.00Ammonium perfluorooctane sulfonatekg
    General
    3.7%
    Special (FTA)
    Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)

    Only if the goods qualify under one of these programs.

    Column 2
    25%

    Countries without normal trade relations.

Schedule footnotes

  • See 9903.88.03.

A reference to Chapter 99 means an additional action — a Section 232 or 301 measure, an exclusion, or a quota — applies on top of the rate above.

This is the listed rate. Antidumping and countervailing duty orders, Chapter 99 actions and preference qualification all change what is actually collected, and classification is a judgement about your goods. Verify with your licensed customs broker before you file.

Other subheadings in heading 2904

Source: U.S. International Trade Commission (USITC) — 2026 HTS Revision 12, released 2026-07-21, published at hts.usitc.gov. A U.S. Government work in the public domain.