HTS heading
3913Natural 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:
Rates as published in 2026 HTS Revision 15, captured 2026-08-13. Source: USITC Harmonized Tariff Schedule.
Current duty rates (4 lines)
| Code | Description | General | Special | Column 2 |
|---|---|---|---|---|
| 3913.10.00.00 | Alginic acid, its salts and esters | 4.2% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 3913.90.10.00 | Chemical derivatives of natural rubber | 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% |
| 3913.90.50.00 | Other | 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% |
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