Code 2901 23 · Heading 2901

Butene (butylene) and its isomers

This category covers acyclic, unsaturated hydrocarbons that are butene (butylene) or its isomers. It is specifically for these compounds, rather than ethylene, propene, buta-1,3-diene, isoprene or other acyclic hydrocarbons.

For example

Butene (butylene)
1-butene
2-butene
Isobutene

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See the official tariff text

Official tariff text

Butene "butylene" and isomers thereof

The path to this code

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

Step 4 of 4

Step 1 · Section VI Products of the chemical or allied industries
Is it an inorganic or organic chemical; a pharmaceutical product; a fertilizer; a tanning or dye extract, pigment, paint, varnish, filler or printing ink; an essential oil, perfume, cosmetic or toilet product; soap, a surface-active, washing, cleaning, polishing or wax product; a protein, modified starch, glue or enzyme; an explosive, pyrotechnic article, match or other specified combustible material; a photographic or cinematographic product; or another chemical product?
✓
Step 2 · Chapter 29 Organic chemicals 2 of 11 chapters in section VI
What type of organic chemical is it—for example, a hydrocarbon, alcohol, acid, nitrogen compound, sulfur compound, heterocyclic compound, vitamin, hormone, glycoside, plant alkaloid, sugar, antibiotic or another listed organic compound?
✓
Step 3 · Heading 2901 Acyclic hydrocarbons 1 of 42 headings under chapter 29
Is it a saturated acyclic hydrocarbon, ethylene, propene, a butene or one of its isomers, buta-1,3-diene, isoprene, or another unsaturated acyclic hydrocarbon?
✓
Step 4 · Subheading 2901 23 Butene "butylene" and isomers thereof 4 of 6 subheadings under heading 2901
Which type of acyclic hydrocarbon is it: saturated, ethylene, propene, butene or one of its isomers, buta-1,3-diene or isoprene, or another unsaturated acyclic hydrocarbon?

Full 8-digit codes

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1 code below this one

2901 23 00 Butene "butylene" and isomers thereof Duty free Save

Compare the sibling codes

2901 10 Saturated acyclic hydrocarbons 0.0%
2901 21 Ethylene 0.0%
2901 22 Propene "propylene" 0.0%
2901 23 Butene "butylene" and isomers thereof you are here 0.0%
2901 24 Buta-1,3-diene and isoprene 0.0%
2901 29 Hydrocarbons, acyclic, unsaturated (excl. ethylene, propene "propylene", butene "butylene" and isomers thereof and Buta-1,3-diene and isoprene) 0.0%

Export to Norway

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

29.01.2300

Butene (butylene) and isomers thereof

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.

2901 23 00 00

Butene (butylene) and isomers thereof

Ordinary duty

Duty free

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 6 codes at this level

Previous code 2901 22

Propene "propylene"

you are here 2901 23

Butene "butylene" and isomers thereof

Next code 2901 24

Buta-1,3-diene and isoprene

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.