Chapter 39: Plastics and articles thereof
HTS heading 3913: Natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural…
8 numbered lines under heading 3913, including 5 10-digit statistical lines. The first six digits are the international HS subheading; the general column is the normal US duty rate.
| HTS code | Description | Unit | General | Special | Column 2 |
|---|---|---|---|---|---|
| 3913 | Natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms: | ||||
| 3913.10.00.00 | Alginic acid, its salts and esters | kg | 4.2% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 3913.90 | Other: | ||||
| 3913.90.10.00 | Chemical derivatives of natural rubber | kg | Free | 20% | |
| 3913.90.20 | Polysaccharides and their derivatives | 5.8% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 50% | |
| 3913.90.20.15 | Xanthan gum | kg | |||
| 3913.90.20.90 | Other | kg | |||
| 3913.90.50.00 | Other | kg | 6.5% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 2.2¢/kg + 33.5% |
Statistical (10-digit) lines without a rate use the rate of the 8-digit line above them. Additional duties such as Section 301 and Section 232 may apply; check them with the tariff checker.
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Request a free auditSource: Harmonized Tariff Schedule of the United States, 2026 HTS Revision 20 (effective 2026-09-28), U.S. International Trade Commission (hts.usitc.gov), imported 2026-10-07. Reference only; not legal or customs advice or a binding classification. Additional duties under Chapter 99 may apply. ShipWave is not affiliated with the USITC or U.S. Customs and Border Protection.