HS code 391390: Natural Polymers
- Covers:
- Natural polymers (for example, alginic acid) and modified natural polymers (for example… not listed under the other codes in this heading.
- Not covered:
- 391310 (Alginic acid, its salts and esters).
- Listed US duty:
- 0%–6.5% (US general rate, HTS 2026)
Official description
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 : Other
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What 391390 covers and what it doesn’t
Official text: 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 › Other.
This is the “other” line of heading 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). It takes goods of that heading that no more specific subheading names. These go elsewhere:
- 391310 Alginic acid, its salts and esters
Nearby codes to check
- Heading 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: every subheading side by side.
US duty rate
0%–6.5%
General (MFN) rate in the US Harmonized Tariff Schedule, 2026 edition. A range means the rate depends on the 8-digit US line your product falls under. Extra duties such as Section 301, Section 232 or anti-dumping orders can apply on top, depending on origin. Check the lines on hts.usitc.gov. Not legal advice.
Who imports under 391390
EximAgent lists companies with recorded shipments under this code, built from customs records, with who they buy from and how often. See importers of 391390 →
Common questions
- What is HS code 391390?
- 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 : Other
- What duty rates apply to 391390?
- Listed US duty: 0%–6.5% (US general rate, HTS 2026).
Browse all of Chapter 39: Plastics and articles thereof →
Go beyond the code
Classify a product and check the duty for your destination with the CLI, then keep researching in your own agent.