Code 3903 90 · Heading 3903

Unprocessed styrene polymers, excluding polystyrene, SAN and ABS

This code covers styrene polymers in unprocessed form, except polystyrene, styrene-acrylonitrile copolymers (SAN) and acrylonitrile-butadiene-styrene copolymers (ABS). It includes the specifically listed styrene copolymers and brominated polystyrene described under the children of this code.

For example

Unprocessed copolymer made exclusively of styrene and allyl alcohol, with an acetyl number of at least 175
Brominated polystyrene containing at least 58% but not more than 71% bromine by weight, in irregular blocks, pieces, powder, granules, flakes or similar forms
Other unprocessed styrene polymer, excluding polystyrene, SAN, ABS, the specified styrene-and-allyl-alcohol copolymer and the specified brominated polystyrene

See the official tariff text

Official tariff text

Polymers of styrene, in primary forms (excl. polystyrene, styrene-acrylonitrile copolymers "SAN" and acrylonitrile-butadiene-styrene "ABS")

How we got to this code

VII
39
3903
3903 90

Show the steps

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 3903 Polymers of styrene, in primary forms 3 of 26 headings under chapter 39
Is it expandable polystyrene, other polystyrene, a SAN copolymer, an ABS copolymer, or another styrene polymer?
✓
Step 4 · Subheading 3903 90 Polymers of styrene, in primary forms (excl. polyst… 5 of 5 subheadings under heading 3903
Which description applies: a copolymer made exclusively of styrene and allyl alcohol with an acetyl number of at least 175; brominated polystyrene containing at least 58% but not more than 71% bromine by weight in irregular blocks, pieces, powder, granules, flakes or similar forms; or another unprocessed styrene polymer covered by the remaining description?

Pick the 8-digit code

Pick the description that best matches your product.

Import duty on the codes below: 0.0–6.5%

3 codes below this one

Compare the sibling codes

See all 5 codes at this level

Classification decides the rate here: from 0.0% to 6.5%.

3903 11 Expansible polystyrene, in primary forms 6.5%
3903 19 Polystyrene, in primary forms (excl. expansible) 6.5%
3903 20 Styrene-acrylonitrile copolymers "SAN", in primary forms 6.5%
3903 30 Acrylonitrile-butadiene-styrene copolymers "ABS", in primary forms 6.5%
3903 90 Polymers of styrene, in primary forms (excl. polystyrene, styrene-acrylonitrile copolymers "SAN" and acrylonitrile-butadiene-styrene "ABS") you are here 0.0–6.5%

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

39.03.9000 Other

Norwegian tariff data checked Sept. 13, 2026.

Great Britain

From 0.0% to 6.0%

Their lines10 British lines

3903 90 10 00 Copolymer, solely of styrene with allyl alcohol, of an acetyl value of 175 or more

Northern Ireland follows other rules.

UK tariff data checked Sept. 13, 2026.

United States

10.0%

Estimated from published US measures

Their lines2 US lines
Entry dateSept. 17, 2026

3903.90.10.00 Polymers of styrene, in primary forms, Other, Methyl methacrylate-butadiene-styrene (MBS)

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.

39.03.9000

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 10 British lines

Selling to Great Britain

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

3903 90 10 00

Copolymer, solely of styrene with allyl alcohol, of an acetyl value of 175 or more

Ordinary duty

Duty free
3903 90 20 00

Brominated polystyrene, containing by weight 58 % or more but not more than 71 % of bromine, in one of the forms mentioned in note 6(b) to this chapter

Ordinary duty

Duty free
3903 90 90 20

Copolymer in the form of granules containing by weight: - 83 ± 3 % styrene, - 7 ± 2 % n-butyl acrylate, - 9 ± 2 % n-butyl methacrylate and - 0,01 % or more but not more than 1 % of polyolefinic wax

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
3903 90 90 35

Copolymer of _α_-methylstyrene and styrene, having a softening point exceeding 113 ºC

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
3903 90 90 38

Polytetrafluoroethylene (CAS RN 9002-84-0) encapsulated with an acrylonitrile-styrene copolymer (CAS RN 9003-54-7), with a content by weight of each polymer of 50 % (± 1 %)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
3903 90 90 43

Mixture of polymers consisting by weight of: -10 % or more but not more than 30 % of a styrene-ethylene-butylene-styrene block copolymer (CAS RN 66070-58-4), -25 % or more but not more than 45 % of mineral oil (CAS RN 8042-47-5), -25 % or more but not more than 45 % of calcium carbonate (CAS RN 1317-65-3), -10 % or more but not more than 20 % of polypropylene (CAS RN 9003-07-0), and -1 % or more but not more than 3 % of a copolymer of α-methylstyrene and vinyltoluene (CAS RN 9017-27-0)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
3903 90 90 60

Copolymer of styrene with maleic anhydride, either partially esterified or completely chemically modified, in flake or powder form

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
3903 90 90 70

Copolymer in the form of granules containing by weight: - 75 % (± 7 %) styrene and - 25 % (± 7 %) methylmethacrylate

Ordinary duty

6.0%

Goods of EU origin

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

Show all 10 lines

3903 90 90 86

Mixture containing by weight: - 45% or more but not more than 65% of polymers of styrene, - 30% or more but not more than 45% of poly(phenylene ether), and - not more than 11% of additives

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
3903 90 90 90

Other

Ordinary duty

6.0%

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 2 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.

3903.90.10.00

Polymers of styrene, in primary forms, Other, Methyl methacrylate-butadiene-styrene (MBS) copolymers

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
3903.90.50.00

Polymers of styrene, 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.