Code 2923 90 · Heading 2923

Other quaternary ammonium salts and hydroxides

This code covers quaternary ammonium salts and quaternary ammonium hydroxides that are not covered by one of the specifically named neighbouring categories. It does not cover choline and its salts, lecithins and other phosphoaminolipids, tetraethylammonium perfluorooctanesulfonate, or didecyldimethylammonium perfluorooctanesulfonate.

For example

A quaternary ammonium salt that is not a choline salt, lecithin or other phosphoaminolipid, tetraethylammonium perfluorooctanesulfonate, or didecyldimethylammonium perfluorooctanesulfonate
A quaternary ammonium hydroxide that is not a choline salt, lecithin or other phosphoaminolipid, tetraethylammonium perfluorooctanesulfonate, or didecyldimethylammonium perfluorooctanesulfonate

Save Browse the codes below

See the official tariff text

Official tariff text

Quaternary ammonium salts and hydroxides (excl. choline and its salts, tetraethylammonium perfluorooctane sulphonate and didecyldimethylammonium perfluorooctane sulphonate)

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 2923 Quaternary ammonium salts and hydroxides; lecithins… 23 of 42 headings under chapter 29
Is it choline or a choline salt; a lecithin or other phosphoaminolipid; tetraethylammonium perfluorooctanesulfonate; didecyldimethylammonium perfluorooctanesulfonate; or another quaternary ammonium salt or quaternary ammonium hydroxide?
✓
Step 4 · Subheading 2923 90 Quaternary ammonium salts and hydroxides (excl. cho… 5 of 5 subheadings under heading 2923
Is the product choline or a choline salt, a lecithin or other phosphoaminolipid, tetraethylammonium perfluorooctanesulfonate, didecyldimethylammonium perfluorooctanesulfonate, or another quaternary ammonium salt or hydroxide?

This is the catch-all under 2923: it covers what the sibling codes below do not.

This is for the quaternary ammonium salts and quaternary ammonium hydroxides in the parent group that are not named by the sibling categories.

Full 8-digit codes

Pick the description that best matches your product.

1 code below this one

2923 90 00 Quaternary ammonium salts and hydroxides (excl. choline and its salts, tetraethylammonium perfluorooctane sulphonate and didecyldimethylammonium perfluorooctane sulphonate) No rate on file Save

Compare the sibling codes

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

2923 10 Choline and its salts 6.5%
2923 20 Lecithins and other phosphoaminolipids, whether or not chemically defined 0.0%
2923 30 Tetraethylammonium perfluorooctane sulphonate 6.5%
2923 40 Didecyldimethylammonium perfluorooctane sulphonate 6.5%
2923 90 Quaternary ammonium salts and hydroxides (excl. choline and its salts, tetraethylammonium perfluorooctane sulphonate and didecyldimethylammonium perfluorooctane sulphonate) you are here No rate on file

Export to Norway

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

29.23.9000

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.

2923 90 00 10

Tetramethylammonium hydroxide, in the form of an aqueous solution containing 25% (± 0,5%) by weight of tetramethylammonium hydroxide

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2923 90 00 13

Bis(N,N,N-trimethyladamantan-1-aminium) sulfate (CAS RN 1000777-61-6) with a purity by weight of 95 % or more, whether or not in aqueous solution containing 20 % or more Bis(N,N,N-trimethyladamantan-1-aminium) sulfate (CAS RN 1000777-61-6)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2923 90 00 30

Tetrabutylammonium tetrahydroborate (CAS RN 33725-74-5) with a purity by weight of 97 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2923 90 00 33

Calcium phosphoryl choline chloride tetrahydrate (CAS RN 72556-74-2) with a purity by weight of 90 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2923 90 00 50

Betaine hydrochloride (CAS RN 590-46-5), with a purity by weight of 93 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2923 90 00 55

Tetrabutylammonium bromide (CAS RN 1643-19-2)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2923 90 00 65

N,N,N-trimethyl-tricyclo[3.3.1.13,7]decan-1-aminium hydroxide (CAS RN 53075-09-5) in form of an aqueous solution with a content of N,N,N-trimethyl-tricyclo[3.3.1.13,7]decan-1-aminium hydroxide by weight of 17,5 % or more but not more than 27,5 %

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2923 90 00 75

Tetraethylammonium hydroxide, in the form of an aqueous solution containing: - 35 % (± 0,5 %) by weight of tetraethylammonium hydroxide, - not more than 1 000 mg/kg of chloride, - not more than 2 mg/kg of iron and - not more than 10 mg/kg of potassium

Ordinary duty

6.0%

Goods of EU origin

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

Show all 13 lines

2923 90 00 80

Diallyldimethylammonium chloride, in the form of an aqueous solution containing by weight 63 % or more but not more than 67 % of diallyldimethylammonium chloride, (CAS RN 7398-69-8)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2923 90 00 85

N,N,N-Trimethylanilinium chloride (CAS RN 138-24-9)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2923 90 00 87

3-Chloro-2-hydroxypropyl)trimethylammonium chloride (CAS RN 3327-22-8), in the form of an aqueous solution containing by weight 65 % or more but not more than 71 % 3-chloro-2-hydroxypropyl)trimethylammonium chloride

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2923 90 00 88

Aqueous solution containing by weight 78 % or more but not more than 82 % of [2-(acryloyloxy)ethyl]trimethylammonium chloride (CAS RN 44992-01-0)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2923 90 00 90

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 5 codes at this level

Previous code 2923 40

Didecyldimethylammonium perfluorooctane sulphonate

you are here 2923 90

Quaternary ammonium salts and hydroxides (excl. choline and its salts…

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.