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Code 3913 90 · Heading 3913

Other natural or modified natural polymers, unworked, excluding alginic acid and its salts and esters

This code covers natural polymers and modified natural polymers, such as hardened proteins and chemical derivatives of natural rubber, when they are unworked and not otherwise specified. It excludes alginic acid and its salts and esters.

For example

  • Unworked hardened protein, not alginic acid or a salt or ester of alginic acid
  • Unworked chemical derivative of natural rubber, not alginic acid or a salt or ester of alginic acid
See the official tariff text

Official tariff text

Natural polymers and modified natural polymers, e.g. hardened proteins, chemical derivatives of natural rubber, n.e.s., in primary forms (excl. alginic acid and its salts and esters)

How we got to this code

  1. VII
  2. 39
  3. 3913
  4. 3913 90
Show the steps

Pick the 8-digit code

Import duty on the codes below: 6.5%

Only one code below

3913 90 00

Natural polymers and modified natural polymers, e.g. hardened proteins, chemical derivatives of natural rubber, n.e.s., in primary forms (excl. alginic acid and its salts and esters)

6.5%

This subheading has one 8-digit code, so that is the code to use.

Open 3913 90 00 Save

This is the catch-all under 3913: it covers what the sibling codes below do not.

This is the code for the other unworked natural or modified natural polymers in the parent group that are not alginic acid or its salts and esters.

Compare the sibling codes

See all 2 codes at this level

Selling to Norway, Great Britain and the United States

What they charge on arrival.

Norway, Great Britain and the United States use their own tariff lines under the 6-digit HS code. The rates below are what their customs charge on goods arriving from the EU. Match the goods against each country's own wording before you rely on a rate.

Norway

Duty free

  • Their lines1 Norwegian line

39.13.9000 Other

Norwegian tariff data checked Sept. 13, 2026.

Great Britain

The rate depends on the line.

  • Their lines7 British lines

3913 90 00 20 Poly(hydroxyalkanoate), predominantly consisting of poly(3-hydroxybutyrate)

Northern Ireland follows other rules.

UK tariff data checked Sept. 13, 2026.

United States

10.0%

Estimated from published US measures

  • Their lines4 US lines
  • Entry dateSept. 17, 2026

3913.90.10.00 Natural polymers (for example, alginic acid) and modified natural polymers

The US importer of record files the entry.

US tariff data checked Sept. 16, 2026.

See the 1 Norwegian line

Selling to Norway

Norway splits the 6-digit category its own way, so these are Norway's own lines under it, not this EU code. Check your product against their wording; what Norwegian customs charges is shown per line.

  • 39.13.9000

    Other

    Ordinary duty
    Duty free

Norwegian tariff data version 1.5/1.2, last checked Sept. 13, 2026.

Contains data from Norwegian Customs (data.toll.no), licensed under CC BY 4.0, adapted for display.

See the 7 British lines

Selling to Great Britain

What UK customs charges when goods like these arrive in Great Britain.

  • 3913 90 00 20

    Poly(hydroxyalkanoate), predominantly consisting of poly(3-hydroxybutyrate)

    Ordinary duty
    Duty free

  • 3913 90 00 40

    Xanthan gum

    Ordinary duty
    Duty free

  • 3913 90 00 85

    Sterile sodium hyaluronate (CAS RN 9067-32-7)

    Ordinary duty
    Duty free

  • 3913 90 00 87

    With: - a weight average molecular weight (Mw) of not more than 900 000, - an endotoxin level of not more than 0,008 Endotoxin units (EU)/mg, - an ethanol content of not more than 1% by weight, - an isopropanol content of not more than 0,5% by weight

    Ordinary duty
    Duty free

  • 3913 90 00 88

    Other

    Ordinary duty
    Duty free

  • 3913 90 00 95

    Chondroitinsulphuric acid, sodium salt (CAS RN 9082-07-9)

    Ordinary duty
    Duty free

  • 3913 90 00 99

    Other

    Ordinary duty
    Depends on the product details
    Goods of EU origin
    Duty free You need documentation of EU preferential origin to use this rate.

These rates apply in Great Britain. Different rules may apply for goods entering Northern Ireland.

UK tariff data version v4.0.1599, last checked Sept. 13, 2026.

Contains public sector information licensed under the Open Government Licence v3.0.

Source: UK Department for Business and Trade (data.api.trade.gov.uk).

See the 4 US lines

Selling to the United States

What US customs charges when goods like these arrive from the EU. The US importer of record files the entry and pays the duty.

  • 3913.90.10.00

    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, Chemical derivatives of natural rubber

    General rate
    Free
    From the EU
    10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99

  • 3913.90.20.15

    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, Polysaccharides and their derivatives, Xanthan gum

    General rate
    5.8%
    From the EU
    10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99

  • 3913.90.20.90

    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, Polysaccharides and their derivatives, Other

    General rate
    5.8%
    From the EU
    10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99

  • 3913.90.50.00

    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

    General rate
    6.5%
    From the EU
    10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99

Worked out for an entry on Sept. 17, 2026.

US tariff schedule 2026HTSRev19, last checked Sept. 16, 2026.

Last change we recorded: Revision 19 (2026), Sept. 16, 2026.

Anti-dumping and countervailing duties, US import taxes and customs fees are not included.

The descriptions above are the US tariff texts, which the United States publishes in English only.

Source: the US International Trade Commission's Harmonized Tariff Schedule (hts.usitc.gov), public domain, and the measures published in the Federal Register.

This is a planning estimate from the US Harmonized Tariff Schedule (revision shown) and the published Federal Register measures as of the date shown, for a shipment of EU origin. It is not a customs entry, legal advice or a broker's opinion, and tariffs.help is not a US-licensed customs broker. The US importer of record or their broker confirms the classification, origin, value and the duty due before filing.

Duty rates shown here are estimates, read from official EU / Danish, Norwegian and UK tariff data for orientation only. Confirm the current rate with Toldstyrelsen, TARIC, Norwegian Customs or the UK Online Trade Tariff before you file. The rate you pay can also depend on the country of origin. These are base customs duties only: import VAT, excise duties, anti-dumping duties and safeguard or quota measures are not included.