tariffs.help
Log in Create free account

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
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)

How we got to this code

  1. VI
  2. 29
  3. 2923
  4. 2923 90
Show the steps

Pick the 8-digit code

Import duty on the codes below: No rate on file

Only one code below

2923 90 00

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

No rate on file

This subheading has one 8-digit code, so that is the code to use.

Open 2923 90 00 Save

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.

Compare the sibling codes

See all 5 codes at this level

Classification decides the rate here: from 0.0% to 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

29.23.9000 Other

Norwegian tariff data checked Sept. 13, 2026.

Great Britain

The rate depends on the line.

  • Their lines13 British lines
  • EU originDuty free

2923 90 00 10 Tetramethylammonium hydroxide, in the form of an aqueous solution containing 25% (± 0,5%)

Northern Ireland follows other rules.

UK tariff data checked Sept. 13, 2026.

United States

10.0%

Estimated from published US measures

  • Their lines1 US line
  • Entry dateSept. 17, 2026

2923.90.01.00 Quaternary ammonium salts and hydroxides; lecithins and other phosphoaminolipids

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.

  • 29.23.9000

    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 13 British lines

Selling to Great Britain

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

  • 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 v4.0.1599, 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 1 US line

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.

  • 2923.90.01.00

    Quaternary ammonium salts and hydroxides; lecithins and other phosphoaminolipids, whether or not chemically defined, Other

    General rate
    6.2%
    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.