Subheading · Chapter 38 · Heading 3811
3811.19: Anti-knock preparations, oxidation inhibitors: anti-knock preparations, other
Official description Other
3811.19 is a six-digit subheading of heading 3811, anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity…, chapter 38.
What you pay
Importing into UK
Rates by national line · UK Global Tariff
UK lines →- 3811 19 00 00 Other 4%
- 3811 19 00 10 Solution of more than 61% but not more than 63% by weight of methylcyclopentadienyl manganese tricarbonyl in an aromatic hydrocarbon solvent, containing by weight not more than: - 4.9% of 1.2,4-trimethyl-benzene, - 4.9% of naphthalene, and - 0.5% of 1.3,5-trimethyl-benzene 4%
- 3811 19 00 90 Other 4%
Additional duties and import rules
Charges on top of the customs duty, and rules the goods must meet at the border.
Additional duties and charges 3
- Duty suspensionAutonomous tariff suspension Free
- Applies to goods from
- all countries
- In force
- until 31 December 2028
- Legal act
- 2020 No. 1435
- Tariff lines
- on 1 of 2 lines
- Duty suspensionAirworthiness tariff suspension Free
- Applies to goods from
- all countries
- Legal act
- S.I. 2018/1249
- Documents
- C119 Authorised Release Certificate — EASA Form 1 (Appendix I to Annex I to Regulation (EU) No 748/2012), or equivalent certificate
- Excise dutyExcises
- Applies to goods from
- all countries
Import requirements 1
- Import controlRestriction on entry into free circulation
- Applies to goods from
- Russia, Ukraine
- Legal act
- 2023 No. 440, S.I. 2022/395
- Documents
- 9011
- 9022
- 9038
- 9009
- 9010
- 9017
Preferential rates by country
| Agreement or scheme | Countries | Rate |
|---|---|---|
| standard rate (no agreement) | — | 4% |
| DCTS Comprehensive | Afghanistan, Angola, Bangladesh, Benin and 38 moreAfghanistan, Angola, Bangladesh, Benin, Bhutan, Burkina Faso, Burundi, Cambodia, Central African Republic, Chad, Comoros, Congo - Kinshasa, Djibouti, Eritrea, Ethiopia, Gambia, Guinea, Guinea-Bissau, Haiti, Kiribati, Laos, Liberia, Malawi, Mali, Mauritania, Myanmar (Burma), Nepal, Niger, Rwanda, São Tomé & Príncipe, Senegal, Sierra Leone, Somalia, South Sudan, Sudan, Tanzania, Timor-Leste, Togo, Tuvalu, Uganda, Yemen, Zambia | Free |
| European Union (including code "EU") | Free | |
| DCTS Enhanced | Algeria, Bolivia, Cape Verde, Congo - Brazzaville and 13 moreAlgeria, Bolivia, Cape Verde, Congo - Brazzaville, Cook Islands, Kyrgyzstan, Micronesia, Mongolia, Nigeria, Niue, Pakistan, Philippines, Sri Lanka, Syria, Tajikistan, Uzbekistan, Vanuatu | Free |
| CARIFORUM | Antigua & Barbuda, Bahamas, Barbados, Belize and 10 moreAntigua & Barbuda, Bahamas, Barbados, Belize, Dominica, Dominican Republic, Grenada, Guyana, Jamaica, St Kitts & Nevis, St Lucia, St Vincent & the Grenadines, Suriname, Trinidad & Tobago | Free |
| OCTs (Overseas Countries and Territories) | Anguilla, Bermuda, British Indian Ocean Territory, British Virgin Islands and 7 moreAnguilla, Bermuda, British Indian Ocean Territory, British Virgin Islands, Cayman Islands, Falkland Islands, Montserrat, Pitcairn Islands, South Georgia & South Sandwich Islands, St Helena, Turks & Caicos Islands | Free |
| Central America | Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama | Free |
| SADC EPA | Botswana, Eswatini, Lesotho, Mozambique, Namibia | Free |
| Eastern and Southern Africa States | Madagascar, Mauritius, Seychelles, Zimbabwe | Free |
| CPTPP | Brunei, Malaysia | Free |
| UK–Andorra agreement | Andorra | Free |
| UK–Albania agreement | Albania | Free |
| UK–Australia agreement | Australia | Free |
| UK–Canada agreement | Canada | Free |
| UK–Switzerland agreement | Switzerland | Free |
| UK–Côte d’Ivoire agreement | Côte d’Ivoire | Free |
| UK–Chile agreement | Chile | Free |
| UK–Cameroon agreement | Cameroon | Free |
| UK–Colombia agreement | Colombia | Free |
| UK–Ceuta & Melilla agreement | Ceuta & Melilla | Free |
| UK–Ecuador agreement | Ecuador | Free |
| UK–Egypt agreement | Egypt | Free |
| UK–Fiji agreement | Fiji | Free |
| UK–Faroe Islands agreement | Faroe Islands | Free |
| UK–Georgia agreement | Georgia | Free |
| UK–Ghana agreement | Ghana | Free |
| DCTS Standard | Indonesia | Free |
| UK–Israel agreement | Israel | Free |
| UK–India agreement | India | Free |
| UK–Iceland agreement | Iceland | Free |
| UK–Jordan agreement | Jordan | Free |
| UK–Japan agreement | Japan | Free |
| UK–Kenya agreement | Kenya | Free |
| UK–South Korea agreement | South Korea | Free |
| UK–Lebanon agreement | Lebanon | Free |
| UK–Liechtenstein agreement | Liechtenstein | Free |
| UK–Morocco agreement | Morocco | Free |
| UK–Moldova agreement | Moldova | Free |
| UK–North Macedonia agreement | North Macedonia | Free |
| UK–Mexico agreement | Mexico | Free |
| UK–Norway agreement | Norway | Free |
| UK–New Zealand agreement | New Zealand | Free |
| UK–Peru agreement | Peru | Free |
| UK–Papua New Guinea agreement | Papua New Guinea | Free |
| UK–Palestinian Territories agreement | Palestinian Territories | Free |
| UK–Serbia agreement | Serbia | Free |
| UK–Solomon Islands agreement | Solomon Islands | Free |
| UK–Singapore agreement | Singapore | Free |
| UK–San Marino agreement | San Marino | Free |
| UK–Tunisia agreement | Tunisia | Free |
| UK–Türkiye agreement | Türkiye | Free |
| UK–Ukraine agreement | Ukraine | Free |
| UK–Vietnam agreement | Vietnam | Free |
| UK–Samoa agreement | Samoa | Free |
| UK–Kosovo agreement | Kosovo | Free |
| UK–South Africa agreement | South Africa | Free |
UK: imports by month
Main suppliers, last 12 months
| Country | Value | Share | Change |
|---|---|---|---|
 United States | £1.6m | 89.9% | -20.4% |
 Netherlands | £149k | 8.5% | +4,016.5% |
 China | £22k | 1.3% | — |
 Germany | £3k | 0.2% | -97.5% |
 France | £2k | 0.1% | -96.6% |
| United Kingdom | £1k | 0.1% | — |
 Ireland | £58 | 0% | -50% |
 South Africa | £0 | 0% | -100% |
Same subheading in other tariffs
EU
TürkiyeWorld trade in 2024
Trade value (US$) no reported trade < US$121.6kUS$121.6k+US$713.3k+US$4.3m+> US$22.3m
Exports: 78
- China: US$42.8m
- India: US$35.7m
- United States: US$22.3m
- Russia: US$12.4m
- Belgium: US$11.9m
- United Kingdom: US$7.7m
- Saudi Arabia: US$7.6m
- Germany: US$4.3m
- Spain: US$3.8m
- Netherlands: US$2.9m
- Japan: US$2.1m
- France: US$2.1m
- Singapore: US$2.1m
- Indonesia: US$2.1m
- South Korea: US$1.4m
- Thailand: US$973.7k
- Serbia: US$901.1k
- Denmark: US$846.4k
- South Africa: US$713.3k
- Taiwan: US$674.9k
- Australia: US$654.9k
- United Arab Emirates: US$592k
- Italy: US$581.3k
- Austria: US$545.9k
- Czechia: US$411.1k
- Slovenia: US$400.6k
- Canada: US$317.9k
- Poland: US$302.5k
- Curaçao: US$205.3k
- Estonia: US$187.3k
- Latvia: US$162k
- Philippines: US$161.5k
- Malaysia: US$150.8k
- Argentina: US$149.8k
- Finland: US$146.6k
- Lithuania: US$132.7k
- Türkiye: US$130.6k
- Greece: US$121.6k
- Mexico: US$103.8k
- Romania: US$101.9k
- Sweden: US$92.7k
- Oman: US$89.6k
- Hong Kong SAR China: US$51.4k
- Colombia: US$47.9k
- Switzerland: US$46.5k
- Egypt: US$45.2k
- North Macedonia: US$37.8k
- Iran: US$37k
- Israel: US$28.2k
- Brazil: US$25.7k
- Croatia: US$23.6k
- Slovakia: US$21.6k
- Kazakhstan: US$19.6k
- Nicaragua: US$19.5k
- Portugal: US$15.3k
- Norway: US$10.2k
- New Zealand: US$10k
- Costa Rica: US$8.4k
- Nigeria: US$7.3k
- Guatemala: US$6.4k
Trade value (US$) no reported trade < US$162.5kUS$162.5k+US$534.6k+US$1.9m+> US$9.3m
Imports: 171
- Belgium: US$24m
- Singapore: US$20.4m
- Netherlands: US$14.4m
- Cyprus: US$13.3m
- Uzbekistan: US$10.1m
- Iraq: US$9.3m
- Tunisia: US$6.5m
- Saudi Arabia: US$5.2m
- Canada: US$4.7m
- United Arab Emirates: US$4.2m
- Philippines: US$3.9m
- Nigeria: US$3.7m
- India: US$3.4m
- United States: US$3m
- South Africa: US$2.6m
- United Kingdom: US$2.3m
- Kyrgyzstan: US$1.9m
- Indonesia: US$1.6m
- Peru: US$1.6m
- Malaysia: US$1.5m
- China: US$1.5m
- Armenia: US$1.2m
- Latvia: US$1.2m
- Mexico: US$1.1m
- Spain: US$1.1m
- Germany: US$944.2k
- Dominican Republic: US$867.6k
- Côte d’Ivoire: US$807.3k
- France: US$803.5k
- Egypt: US$792.3k
- Algeria: US$770.1k
- South Korea: US$759.3k
- Vietnam: US$742.7k
- Bahrain: US$707.9k
- Guatemala: US$633.8k
- Czechia: US$609.5k
- Greece: US$572k
- Honduras: US$554.8k
- Senegal: US$549.9k
- Austria: US$548.7k
- Poland: US$548.6k
- Brazil: US$537.9k
- Papua New Guinea: US$534.6k
- Thailand: US$505.6k
- Kazakhstan: US$483.3k
- Nicaragua: US$476.8k
- Pakistan: US$450.2k
- Belize: US$428k
- Ireland: US$399k
- Slovakia: US$398.4k
- Kuwait: US$397.4k
- Denmark: US$394.1k
- Botswana: US$370.8k
- Russia: US$361.2k
- Azerbaijan: US$360k
- Qatar: US$348.4k
- Italy: US$343.7k
- Japan: US$340.4k
- Estonia: US$304.5k
- Ecuador: US$300.7k
Top exporters
| Rank | Country | Value | Share |
|---|---|---|---|
| 1 | China | US$42.8m | 25% |
| 2 |  India | US$35.7m | 20.8% |
| 3 | United States | US$22.3m | 13% |
| 4 |  Russia | US$12.4m | 7.2% |
| 5 |  Belgium | US$11.9m | 7% |
| 6 | United Kingdom | US$7.7m | 4.5% |
| 7 |  Saudi Arabia | US$7.6m | 4.5% |
| 8 | Germany | US$4.3m | 2.5% |
| 9 |  Spain | US$3.8m | 2.2% |
| 10 | Netherlands | US$2.9m | 1.7% |
Top importers
| Rank | Country | Value | Share |
|---|---|---|---|
| 1 | Belgium | US$24m | 14% |
| 2 |  Singapore | US$20.4m | 11.9% |
| 3 | Netherlands | US$14.4m | 8.4% |
| 4 |  Cyprus | US$13.3m | 7.8% |
| 5 |  Uzbekistan | US$10.1m | 5.9% |
| 6 |  Iraq | US$9.3m | 5.4% |
| 7 |  Tunisia | US$6.5m | 3.8% |
| 8 | Saudi Arabia | US$5.2m | 3% |
| 9 |  Canada | US$4.7m | 2.7% |
| 10 |  United Arab Emirates | US$4.2m | 2.5% |
Recent rule changes mentioning this code
Acts whose text cites this code or its heading. Check the act itself: a code can be cited for reasons other than a change of its duty.
- Other
Update to Fuel Excise Duty Rates for Tax Types X542, X556 and X571– 8 June 2026
Trade Tariff news 6698 · Source: trade-tariff.service.gov.uk
In the UK Global Tariff, subheading 3811.19 covers 2 tariff lines and the duty is 4%.
The EU Combined Nomenclature has one tariff line for subheading 3811.19; the duty is 5.8%.
Goods from 174 countries can enter the UK at a preferential rate instead of the standard 4%; 174 of them pay no duty at all, for example under DCTS Comprehensive or European Union.
In the 12 months to August 2026, the UK imported these goods worth £1.8m (down 19% on the year before), at an average of £4.98 per kg; United States supplied 90%, followed by Netherlands.
World trade in these goods reached US$171.6m in 2024, down 29.7% on 2023.
China was the largest exporter with 25% of the total, ahead of India.
Questions and answers
What is the HS code for anti-knock preparations, oxidation inhibitors: anti-knock preparations, other?
Anti-knock preparations, oxidation inhibitors: anti-knock preparations, other fall under HS subheading 3811.19, part of heading 3811, in section VI of the Harmonized System.
What is the import duty on anti-knock preparations, oxidation inhibitors in the UK?
Under the UK Global Tariff, imports under 3811.19 from countries without a preferential agreement are charged at 4%. Preferential rates, anti-dumping duties and VAT are not included.
What is the import duty on anti-knock preparations, oxidation inhibitors in the EU?
Under the EU Combined Nomenclature, imports under 3811.19 from countries without a preferential agreement are charged at 5.8%. Preferential rates, anti-dumping duties and VAT are not included.
Which country exports the most anti-knock preparations, oxidation inhibitors?
China, with US$42.8m in 2024 (25% of world exports).
Which countries can export these goods to the UK duty-free?
174 countries pay no duty under a trade agreement or preference scheme, among them partners under DCTS Comprehensive, European Union, DCTS Enhanced. The goods must meet the agreement’s rules of origin and the importer needs proof of origin; otherwise the standard rate of 4% applies. Pick a country above to see its rate.
Where does the UK import these goods from?
In the 12 months to August 2026, the largest suppliers were United States (90%), Netherlands (9%) and China (1%), out of total imports of £1.8m.