Code 2904 35 · Heading 2904

Perfluorooctanesulfonate salts, excluding ammonium, lithium, potassium and perfluorooctanesulfonates

This category covers salts of perfluorooctanesulfonate. It excludes ammonium, lithium and potassium salts, as well as perfluorooctanesulfonates.

For example

A perfluorooctanesulfonate salt, excluding ammonium, lithium, potassium and perfluorooctanesulfonates

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See the official tariff text

Official tariff text

Salts of perfluorooctane sulphonic acid (excl. ammonium, lithium and potassium perfluorooctane sulphonates)

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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 2904 Sulphonated, nitrated or nitrosated derivatives of … 4 of 42 headings under chapter 29
Is it a hydrocarbon derivative containing only sulfo groups, including a salt or ethyl ester; a derivative containing only nitro or nitroso groups; a listed perfluorooctanesulfonate or perfluorooctanesulfonyl fluoride; trichloronitromethane (chloropicrin); or another nitro- or nitroso-derivative covered here?
✓
Step 4 · Subheading 2904 35 Salts of perfluorooctane sulphonic acid (excl. ammo… 7 of 10 subheadings under heading 2904
Is it a perfluorooctanesulfonate, an ammonium, lithium or potassium perfluorooctanesulfonate, another perfluorooctanesulfonate salt, a perfluorooctanesulfonyl fluoride, trichloronitromethane, or another nitro or nitroso derivative?

Full 8-digit codes

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1 code below this one

2904 35 00 Salts of perfluorooctane sulphonic acid (excl. ammonium, lithium and potassium perfluorooctane sulphonates) 5.5% Save

Compare the sibling codes

2904 10 Derivatives of hydrocarbons containing only sulpho groups, their salts and ethyl esters 5.5%
2904 20 Derivatives of hydrocarbons containing only nitro or nitroso groups 5.5%
2904 31 Perfluorooctane sulphonic acid 5.5%
2904 32 Ammonium perfluorooctane sulphonate 5.5%
2904 33 Lithium perfluorooctane sulphonate 5.5%
2904 34 Potassium perfluorooctane sulphonate 5.5%
2904 35 Salts of perfluorooctane sulphonic acid (excl. ammonium, lithium and potassium perfluorooctane sulphonates) you are here 5.5%
2904 36 Perfluorooctane sulphonyl fluoride 5.5%
2904 91 Trichloronitromethane "chloropicrin" 5.5%
2904 99 Sulphonated, nitrated or nitrosated derivatives of hydrocarbons, whether or not halogenated (excl. those containing only sulpho, nitro or nitroso groups, trichloronitromethane "chloropicrin", perfluorooctane sulphonic acid and its salts, perfluorooctane sulphonyl fluoride and esters of glycerol formed with acid-function compounds) No rate on file

Export to Norway

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

29.04.3500

Other salts of perfluorooctane sulphonic acid

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.

2904 35 00 00

Other salts of perfluorooctane sulphonic acid

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

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See all 10 codes at this level

Previous code 2904 34

Potassium perfluorooctane sulphonate

you are here 2904 35

Salts of perfluorooctane sulphonic acid (excl. ammonium, lithium and …

Next code 2904 36

Perfluorooctane sulphonyl fluoride

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.