Code 2931 90 · Heading 2931

Other isolated, chemically defined organo-inorganic compounds, excluding organic sulfur and mercury compounds

This code covers isolated, chemically defined organo-inorganic compounds that are not covered by one of the specifically named neighbouring classes. Organic sulfur compounds and mercury compounds are excluded.

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Official tariff text

Separate chemically defined organo-inorganic compounds (excl. organo-sulphur, mercury, tetramethyl lead, tetraethyl lead and tributyltin compounds, and organo-phosphorous derivatives)

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 2931 Separate chemically defined organo-inorganic compou… 31 of 42 headings under chapter 29
Is it tetramethyllead or tetraethyllead; a tributyltin compound; one of the specifically named phosphorus compounds; a derivative of a non-halogenated or halogenated organic phosphorus compound; or another organic–inorganic compound not specified elsewhere?
✓
Step 4 · Subheading 2931 90 Separate chemically defined organo-inorganic compou… 17 of 17 subheadings under heading 2931
Which specifically named class does the compound match: tetramethyllead or tetraethyllead, a tributyltin compound, one of the listed phosphonate or phosphorus-compound classes, or none of these?

This is the catch-all under 2931: it covers what the sibling codes below do not.

This is the remainder for the parent group: isolated, chemically defined organo-inorganic compounds that are not organic sulfur or mercury compounds and do not belong to any of the specifically named neighbouring classes.

Full 8-digit codes

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1 code below this one

2931 90 00 Separate chemically defined organo-inorganic compounds (excl. organo-sulphur, mercury, tetramethyl lead, tetraethyl lead and tributyltin compounds, and organo-phosphorous derivatives) No rate on file Save

Compare the sibling codes

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

2931 10 Tetramethyl lead and tetraethyl lead 6.5%
2931 20 Tributyltin compounds 6.5%
2931 41 Dimethyl methylphosphonate 6.5%
2931 42 Dimethyl propylphosphonate 6.5%
2931 43 Diethyl ethylphosphonate 6.5%
2931 44 Methylphosphonic acid 6.5%
2931 45 Salt of methylphosphonic acid and (aminoiminomethyl)urea (1: 1) 6.5%
2931 46 2,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide 6.5%
2931 47 (5-Ethyl-2-methyl-2-oxido-1,3,2-dioxaphosphinan-5-yl) methyl methyl methylphosphonate 6.5%
2931 48 3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5] undecane 3,9-dioxide 6.5%
2931 49 Separate chemically defined non-halogenated organo-phosphorous derivatives, n.e.s. 0.0–6.5%
2931 51 Methylphosphonic dichloride 6.5%
2931 52 Propylphosphonic dichloride 6.5%
2931 53 O-(3-chloropropyl) O-[4-nitro-3-(trifluoromethyl)phenyl] methylphosphonothionate 6.5%
2931 54 Trichlorfon "ISO" 0.0%
2931 59 Separate chemically defined halogenated organo-phosphorous derivatives, n.e.s. 6.5%
2931 90 Separate chemically defined organo-inorganic compounds (excl. organo-sulphur, mercury, tetramethyl lead, tetraethyl lead and tributyltin compounds, and organo-phosphorous derivatives) you are here No rate on file

Export to Norway

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

29.31.9001

2-Chlorovinyldichlorasine, bis(2-chlorovinyl)chlorarsine, tris(2-chlorovinyl)arsine

Ordinary duty

Duty free

Goods of EU origin

Duty free You need documentation of EU origin to use this rate.
29.31.9009

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.

2931 90 00 15

Methylcyclopentadienyl manganese tricarbonyl (CAS RN 12108-13-3) containing not more than 4,9 % by weight of cyclopentadienyl manganese tricarbonyl

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2931 90 00 21

(2-Fluoro-4-phenoxyphenyl)boronic acid (CAS RN 1414356-30-1) with a purity by weight of 95 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2931 90 00 23

Ixazomib citrate (INNM) (CAS RN 1239908-20-3) with a purity by weight of 95 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2931 90 00 28

Triethoxy(3-isocyanatopropyl)silane (CAS RN 24801-88-5) with a purity by weight of 96 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2931 90 00 30

Tert-Butylchlorodimethylsilane (CAS RN 18162-48-6) with a purity by weight of 99 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2931 90 00 38

2-(Trimethylsilyl)ethoxymethyl chloride (CAS RN 76513-69-4) with a purity by weight of 98 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2931 90 00 40

Chlorotrimethylsilane (CAS RN 75-77-4) with a purity by weight of 98 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2931 90 00 43

Trimethylindium (CAS RN 3385-78-2) with a purity by weight of 99 % or more

Ordinary duty

6.0%

Goods of EU origin

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

Show all 15 lines

2931 90 00 48

4-Phenoxybenzeneboronic acid (CAS RN 51067-38-0) with a purity by weight of 98 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2931 90 00 50

Trimethylsilane (CAS RN 993-07-7)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2931 90 00 55

3-(Hydroxymethyl)phenylboronic acid (CAS RN 87199-15-3) with a purity by weight of 95 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2931 90 00 58

Trimethylgallium (CAS RN 1445-79-0) with a purity by weight of 99 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2931 90 00 68

Hydrogen tetrakis(pentafluorophenyl)borate(1-)-N,N-dimethylaniline (1:1) (CAS RN 118612-00-3) with a purity by weight of 99 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2931 90 00 75

Hexadecyltrimethoxysilane (CAS RN 16415-12-6) with a purity by weight of at least 95 %, for use in the manufacture of polyethylene

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2931 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 17 codes at this level

Previous code 2931 59

Separate chemically defined halogenated organo-phosphorous derivative…

you are here 2931 90

Separate chemically defined organo-inorganic compounds (excl. organo-…

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.