Section VI · Organic chemicals

2922.21

Aminohydroxynaphthalenesulfonic acids and their salts:

How this code is built
29

Chapter

Organic chemicals

22

Heading

The product family within the chapter

21

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. 2922Oxygen-function amino-compounds:
  3. Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof:
  4. Aminohydroxynaphthalenesulfonic acids and their salts:

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.

  • 2922.21.10.001-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid (Chicago acid); 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, potassium salt; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, sodium salt; 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, monosodium salt (H acid, monosodium salt); 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, potassium salt (H acid, monopotassium salt); 4-Amino-3-hydroxy-1-naphthalenesulfonic acid; 6-Amino-1-naphthol-3-sulfonic acid and its salts; and 8-Amino-1-naphthol-5-sulfonic acid and its saltskg
    General
    5.8%
    Special (FTA)
    Free (A+,AU,BH,CL,CO,D,E,IL,JO,KR,L,MA,OM,P,PA,PE,S,SG)

    Only if the goods qualify under one of these programs.

    Column 2
    15.4¢/kg + 39%

    Countries without normal trade relations.

  • 2922.21.25.001-Amino-8-hydroxy-4,6-naphthalenedisulfonic acid, monosodium saltkg
    General
    Free
    Special (FTA)
    —

    No preferential rate published.

    Column 2
    15.4¢/kg + 50%

    Countries without normal trade relations.

  • 2922.21.40.00Products described in additional U.S. note 3 to section VIkg
    General
    6.5%
    Special (FTA)
    Free (A+,AU,BH,CL,CO,D,E,IL,JO,KR,L,MA,OM,P,PA,PE,S,SG)

    Only if the goods qualify under one of these programs.

    Column 2
    15.4¢/kg + 50%

    Countries without normal trade relations.

  • 2922.21.50.00Otherkg
    General
    6.5%
    Special (FTA)
    Free (A+,AU,BH,CL,CO,D,E,IL,JO,KR,L,MA,OM,P,PA,PE,S,SG)

    Only if the goods qualify under one of these programs.

    Column 2
    15.4¢/kg + 50%

    Countries without normal trade relations.

Schedule footnotes

  • See 9903.88.03.
  • See 9903.88.15.

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 2922

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.