Section VI · Albuminoidal substances; modified starches; glues; enzymes

3506.91

Adhesives based on polymers of headings 3901 to 3913 or on rubber:

How this code is built
35

Chapter

Albuminoidal substances; modified starches; glues; enzymes

06

Heading

The product family within the chapter

91

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. 35Albuminoidal substances; modified starches; glues; enzymes
  2. 3506Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg:
  3. Other:
  4. Adhesives based on polymers of headings 3901 to 3913 or on rubber:

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.

  • 3506.91.10.00Optically clear free-film adhesives and optically clear curable liquid adhesives of a kind used solely or principally for the manufacture of flat panel displays or touch-sensitive screen panelskg
    General
    Free
    Special (FTA)
    —

    No preferential rate published.

    Column 2
    20%

    Countries without normal trade relations.

  • 3506.91.50.00Otherkg
    General
    2.1%
    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
    20%

    Countries without normal trade relations.

Schedule footnotes

  • See 9903.88.03.
  • See 9903.90.08.

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 3506

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.