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

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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)

The path to this code

Every code is reached through these choices, one level at a time.

Step 4 of 4

Step 1 · Section VII Plastics and articles thereof; rubber and articles …
Is the product made of plastic, or is it made of rubber?
✓
Step 2 · Chapter 39 Plastics and articles thereof 1 of 2 chapters in section VII
What kind of plastic product is it: an unworked polymer or ion exchanger, plastic waste, a monofilament, rod or profile, a pipe or hose, a floor or wall covering, a flat plastic form, a sanitary item, a transport or packaging item, a household or toilet item, building equipment, or another plastic article?
✓
Step 3 · Heading 3913 Natural polymers, e.g. alginic acid, and modified n… 13 of 26 headings under chapter 39
Is it alginic acid, a salt of alginic acid or an ester of alginic acid?
✓
Step 4 · Subheading 3913 90 Natural polymers and modified natural polymers, e.g… 2 of 2 subheadings under heading 3913
Is it alginic acid, or a salt or ester of alginic acid, in unworked form?

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.

3913 10 Alginic acid, its salts and esters, in primary forms

Full 8-digit codes

Pick the description that best matches your product.

1 code below this one

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% Save

Compare the sibling codes

3913 10 Alginic acid, its salts and esters, in primary forms 5.0%
3913 90 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) you are here 6.5%

Export to Norway

What Norwegian customs charges when goods like these are imported into Norway.

39.13.9000

Other

Ordinary duty

Duty free

Goods of EU origin

Duty free You need documentation of EU origin to use this rate.

Norwegian tariff data version 1.5/1.2, last checked Aug. 9, 2026.

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

Export to the United Kingdom

What UK customs charges when goods like these are imported into the UK.

3913 90 00 20

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

Ordinary duty

Duty free

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
3913 90 00 40

Xanthan gum

Ordinary duty

Duty free

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
3913 90 00 85

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

Ordinary duty

Duty free

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
3913 90 00 87

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

Ordinary duty

Duty free

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
3913 90 00 88

Other

Ordinary duty

Duty free

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
3913 90 00 95

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

Ordinary duty

Duty free

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
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 v4.0.1576, last checked Aug. 9, 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).

Check the neighbouring codes

The codes just before and after this one, in case a nearby group fits better.

See all 2 codes at this level

Previous code 3913 10

Alginic acid, its salts and esters, in primary forms

you are here 3913 90

Natural polymers and modified natural polymers, e.g. hardened protein…

Duty rates shown here are estimates, read from official EU / Danish, Norwegian and UK tariff data for orientation only. Confirm the current rate with SKAT, 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.