Section VI · Miscellaneous chemical products

3812.31

Mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ)

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How this code is built
38

Chapter

Miscellaneous chemical products

12

Heading

The product family within the chapter

31

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. 38Miscellaneous chemical products
  2. 3812Prepared rubber accelerators; compound plasticizers for rubber or plastics, not elsewhere specified or included; antioxidizing preparations and other compound stabilizers for rubber or plastics:
  3. Anti-oxidizing preparations and other compound stabilizers for rubber or plastics:
  4. Mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ)

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.

  • 3812.31.00.00Mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ)kg
    General
    6.5%
    Special (FTA)
    Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)

    Only if the goods qualify under one of these programs.

    Column 2
    3.7¢/kg + 60%

    Countries without normal trade relations.

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.

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Other subheadings in heading 3812

Source: U.S. International Trade Commission (USITC) — 2026 HTS Revision 20, released 2026-09-28, published at hts.usitc.gov. A U.S. Government work in the public domain.