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Code 2923 90 00 · Subheading 2923 90

Final code reached

Other quaternary ammonium salts and quaternary ammonium hydroxides

This is a complete 8-digit customs code. There is no further code choice to make below it.

This code covers quaternary ammonium salts and quaternary ammonium hydroxides that are not otherwise specifically named in this group. It does not cover the separately listed choline and its salts, lecithins and other phosphoaminolipids, tetraethylammonium perfluorooctanesulfonate, or didecyldimethylammonium perfluorooctanesulfonate.

For example

  • A quaternary ammonium salt other than choline and its salts, lecithins and other phosphoaminolipids, tetraethylammonium perfluorooctanesulfonate, or didecyldimethylammonium perfluorooctanesulfonate
  • A quaternary ammonium hydroxide other than the separately named products in this group
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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)

Classification complete

2923 90 00

Other quaternary ammonium salts and quaternary ammonium hydroxides

The spaces only make the code easier to read. Customs declarations normally use the unspaced form, 29239000.

See how EU customs ruled on similar products

Trade measures to be aware of

Besides the ordinary duty, the EU records these kinds of measure against this code. They are listed as signals only: whether one applies to your goods can depend on where they come from, who produced them, the exact product and the documents you present. No amounts are worked out here.

  • Lower duty for goods from some countries

    Preferential rates exist for goods originating in San Marino; Economic Partnership Agreements; CARIFORUM except Haiti; Comoros (excluding Mayotte), Madagascar, Mauritius, Seychelles and dependencies and Zimbabwe; Botswana, Eswatini, Lesotho, Mozambique and Namibia; GSP-EBA (Special arrangement for the least-developed countries - Everything But Arms); OCTs (Overseas Countries and Territories); Ivory Coast; 52 more origins. Whether you can use one depends on the origin rules for the goods and on the documentation you can show.

    Check this code in the official EU TARIC database

  • A limited quantity at a lower rate

    A tariff quota is recorded for this code. This does not say whether any of the quota is still available. It covers goods originating in any country except Belarus and Russian Federation.

    This is recorded on a more detailed code below this one, so it may not cover your goods.

    Check this code in the official EU TARIC database

  • Restrictions and paperwork

    Import restrictions are recorded for goods originating in Ukraine; Japan; Belarus; Russian Federation; any country.

    Document or certificate conditions are recorded. Customs may ask for:

    • Movement certificate EUR.1
    • Invoice declaration or origin declaration made out by any exporter on invoice or any other commercial document
    • Goods not originating from or destined to Crimea or Sevastopol (Articles 2 and 2b.1 of Council Regulation (EU) No 692/2014)
    • Goods not originating from or not destined for the non-government controlled areas of Ukraine in the oblasts of Donetsk, Kherson, Luhansk and Zaporizhzhia
    • The products are accompanied by a declaration issued before 1 November 2012 in accordance with the Implementing Regulation (EU) No 284/2012 and stating that the products have left Japan before 1 December 2012
    • The products left Japan before 30.10.2012 and comply with Implementing Regulation (EU) No 284/2012
    Show all 24 document conditions
    • The products are accompanied by a declaration issued before 1.6.2013 in accordance with the Implementing Regulation (EU) No 996/2012 and stating that the products have left Japan before 1.7.2013
    • The products left Japan before 2.6.2013 and comply with Implementing Regulation (EU) No 996/2012
    • Products which left Japan before 28 March 2011
    • Declaration for the import into the European Union of feed and food originating in or consigned from Japan (Commission Implementing Regulation (EU) No 322/2014)
    • Declaration for the import into the European Union of feed and food originating in or consigned from Japan (Commission Implementing Regulation (EU) No 322/2014); the products left Japan before 9 January 2016
    • Declaration for the import into the European Union of feed and food originating in or consigned from Japan (Commission Implementing Regulation (EU) No 996/2012) which was issued before 1 April 2014; the products left Japan from 1 April 2014 but before 1 May 2014
    • Common Health Entry Document for Feed and Food of Non-Animal Origin (CHED-D) (as set out in Part 2, Section D of Annex II to Commission Implementing Regulation (EU) 2019/1715 (OJ L 261))
    • Import authorisation by virtue of article 1ra paragraph 10 of Council Regulation (EU) 765/2006
    • The prohibitions defined in article 1ra paragraph 1 of Council Regulation (EU) No 765/2006 do not apply (see exemptions in article 1ra paragraph 4)
    • The prohibitions defined in article 1ra paragraph 1 of Council Regulation (EU) No 765/2006 do not apply (see exemptions in article 1ra paragraph 3)
    • Goods entered the territory of the customs union of the EU and presented to customs authorities prior to the entry into force or to applicability date of the present sanction, whichever is latest (see Article 8f of Regulation (EU) No 765/2006)
    • The prohibitions defined in article 3i.1 of Council Regulation (EU) No 833/2014 do not apply (see exemptions in article 3i.3aa)
    • Import authorisation by virtue of article 12b.2 of Council Regulation (EU) 833/2014
    • Goods entered the territory of the customs union of the EU and presented to customs authorities prior to the entry into force or to applicability date of the present sanction, whichever is latest (see Article 12e of Regulation (EU) No 833/2014)
    • Import authorisation by virtue of article 3i paragraph 3c of Council Regulation (EU) 833/2014
    • Exemption from REACH restrictions by virtue of Article 67(1) and 67(2) of Regulation (EC) No 1907/2006
    • Substance/mixture not subjected to the provisions of Regulation (EC) No 1907/2006 (Annex XVII)
    • Compliance with the REACH restrictions defined in Column 2 of Annex XVII of Regulation (EC) No 1907/2006
    Check this code in the official EU TARIC database

EU tariff measure data version 2026-08-03-tullverket.

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: <br><br><br>- 35 % (± 0,5 %) by weight of tetraethylammonium hydroxide, <br> <br><br><br>- not more than 1 000 mg/kg of chloride, <br> <br><br><br>- not more than 2 mg/kg of iron and <br> <br><br><br>- 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).

Before you use the code

Check the facts that sit outside the code

The code can be right while what you pay still changes, because of where the goods come from, when they arrive, or extra EU measures.

Classify your own product, free Look up the current rates and rules
  1. The product and its form Check that your product really matches this description, including what it is made of and the form it arrives in.
  2. Country of origin Trade agreements, sanctions and extra measures can change the treatment of the very same code.
  3. Current tariff measures Check today's rate, any restrictions or licences, and the quantity customs asks for, with SKAT or TARIC.

Worth comparing

Codes that sit close to this one, for when the material itself could be different.

Browse chapter 29

Similar products elsewhere in the tariff

Often confused with

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.