Subheading · Chapter 38 · Heading 3815

3815.90

3815.90: Reaction initiators, reaction accelerators and catalytic: other

Other catalytic preparations

Official description Other

3815.90 is the HS subheading for other catalytic preparations, under heading 3815 in chapter 38.

What you pay

Importing into UK

Customs duty Free – 6% standard rate · across 16 national lines depends on the country of origin
Additional duties and charges 4 additional measures Import requirements: 4
VAT 20.00 % import VAT
Duty calculatorCalculate duty and taxes →

Rates by national line · UK Global Tariff

UK lines →
  1. 3815 90 00 00 Other
  2. 3815 90 10 00 Catalyst consisting of ethyltriphenylphosphonium acetate in the form of a solution in methanol Free
  3. 3815 90 90 00 Other 6%
  4. 3815 90 90 16 Initiator based on dimethylaminopropyl urea 6%
  5. 3815 90 90 30 Catalyst, consisting of a suspension in mineral oil of: - tetrahydrofuran complexes of magnesium chloride and titanium(iii) chloride; and - silicon dioxide - containing 6.6% (± 0.6%) by weight of magnesium, and - containing 2.3% (± 0.2%) by weight of titanium 6%
  6. 3815 90 90 38 Photoinitiator, containing by weight: -80% or more of polyethylene glycol di[β-4-[4-(2-dimethylamino-2-benzyl)butanoylphenyl]piperazine]propionate (cas rn 886463-10-1), -not more than 17% of polyethylene glycol [β-4-[4-(2-dimethylamino-2-benzyl)butanoylphenyl]piperazine]propionate 6%
  7. 3815 90 90 43 Catalyst in powder form consisting by weight of -92.50% (± 2) % titanium dioxide (cas rn 13463-67-7) -5% (± 1) % silicon dioxide (cas rn 112926-00-8) and -2.5% (± 1.5) % sulphur trioxide (cas rn 7446-11-9) 6%
  8. 3815 90 90 48 Photoinitiator containing by weight: -88% or more of α-(2-benzoylbenzoyl)-ω-[(2-benzoylbenzoyl)oxy]-poly(oxy-1.2-ethanediyl) (cas rn 1246194-73-9), -not more than 12% of α-(2-benzoylbenzoyl)-ω-hydroxy-poly(oxy-1.2-ethanediyl) (cas rn 1648797-60-7) 6%
  9. 3815 90 90 50 Catalyst containing titanium trichloride, in the form of a suspension in hexane or heptane containing by weight, in the hexane- or heptane-free material, 9% or more but not more than 30% of titanium 6%
  10. 3815 90 90 55 Catalytic additives for fluid catalytic cracking (fcc), not containing y type zeolite (cas rn 308079-79-0), and not being a fcc (fluid catalytic cracking) base catalyst, in the form of powder, consisting of a mixture of one or more of the following active substances: -calcium carbonate (cas rn 471-34-1), -copper oxide (cas rn 1217-38-0), -iron oxide (cas rn 1309-37-1), -aluminium magnesium vanadium oxide (cas rn 70621-8-0), -vanadium pentoxide (cas rn 1314-62-1), -aluminium phosphate (cas rn 7784-30-7), -cerium oxide (cas rn 1306-38-3), -zsm-5 type zeolite (cas rn 308081-08-5), and one or more of the following inert substances: -magnesium oxide (cas rn 1309-48-8), -aluminium oxide (cas rn 1344-28-1), -kaolin (cas rn 1332-58-7) 6%
  11. 3815 90 90 58 1.1′-bis(4-triethylsilylphenyl)methylene(cyclopentadienyl)(2.7-di-tert-butyl-9-fluorenyl)dimethylhafnium (cas rn 264926-41-2) in the form of a hexane (cas rn 110-54-3) solution, containing by weight 2.0% or more but not more than 2.5% of 1.1′-bis(4-triethylsilylphenyl)methylene(cyclopentadienyl)(2.7-di-tert-butyl-9-fluorenyl)dimethylhafnium 6%
  12. 3815 90 90 60 Dinonylnaphthalenedisulfonic acid (cas rn 60223-95-2) with a content by weight of 50% or more but not more than 65%, in the form of a solution in isobutanol (cas rn 78-83-1) 6%
  13. 3815 90 90 76 Catalyst consisting of titanium dioxide and tungsten trioxide 6%
  14. 3815 90 90 81 Catalyst, containing by weight 69% or more but not more than 79% of (2-hydroxy-1-methylethyl)trimethylammonium 2-ethylhexanoate 6%
  15. 3815 90 90 85 Catalyst based on aluminosilicate (zeolite), for the alkylation of aromatic hydrocarbons, for the transalkylation of alkylaromatic hydrocarbons or for the oligomerisation of olefins 6%
  16. 3815 90 90 88 Catalyst, consisting of titanium tetrachloride and magnesium chloride, containing by weight on an oil- and hexane-free basis: - 4% or more but not more than 10% of titanium and - 10% or more but not more than 20% magnesium 6%
  17. 3815 90 90 89 Rhodococcus rhodocrous j1 bacteria, containing enzymes, suspended in a polyacrylamide gel or in water, for use as a catalyst in the production of acrylamide by the hydration of acrylonitrile 6%
  18. 3815 90 90 90 Other 6%

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 4

  • Additional dutyAdditional duties 35%
    Applies to goods from
    Belarus, Russia
    Legal act
    2022 No. 598
    Documents
    • 9014
  • 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
  • Duty suspensionAutonomous tariff suspension Free
    Applies to goods from
    all countries
    In force
    until 31 December 2028
    Legal act
    2020 No. 1435
    Documents
    • 9Y12
    Tariff lines
    on 9 of 16 lines
  • Duty suspensionAutonomous suspension under end-use Free
    Applies to goods from
    all countries
    In force
    until 31 December 2028
    Legal act
    2020 No. 1435
    Documents
    • N990 EUS - Authorisation for the use of end use procedure (Column 8c, Annex A of Delegated Regulation (EU) 2015/2446)
    Tariff lines
    on 1 of 16 lines

Import requirements 4

  • Prohibition or restrictionImport prohibition
    Applies to goods from
    North Korea
    Legal act
    S.I. 2019/411
  • Import controlRestriction on entry into free circulation
    Applies to goods from
    Ukraine
    Legal act
    S.I. 2022/395
    Documents
    • 9009
    • 9010
    • 9017
  • Import controlImport control on restricted goods and technologies
    Applies to goods from
    Iran, North Korea
    Legal act
    S.I. 2019/461, S.I. 2019/411
    Documents
    • Y966 Goods other than those described in the MG footnotes linked to the measure (Missile Technology Control Regime list - Annex III of Reg. (EU) 267/2012)
    • Y920 Goods other than those described in the footnotes linked to the measure
  • Import controlImport control - Waste
    Applies to goods from
    all countries
    Legal act
    S.I. 2019/590
    Documents
    • C672 Information document accompanying shipments of waste as mentioned in Regulation (EU) 2024/1157 – Article 18 and Annex VII
    • C669 Notification document as mentioned in Regulation (EU) 2024/1157 - Article 5 and Annex IA
    • Y923 Product not subjected to the provisions of Regulation (EU) 2024/1157
    • C670 Movement document as mentioned in Regulation (EU) 2024/1157 – Article 5 and Annex IB
    Tariff lines
    on 15 of 16 lines

Preferential rates by country

Agreement or schemeCountriesRate
standard rate (no agreement)—Free – 6%
DCTS Comprehensive
Afghanistan, Angola, Bangladesh, Benin and 38 more

Afghanistan, 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")
Austria, Belgium, Bulgaria, Croatia and 23 more

Austria, Belgium, Bulgaria, Croatia, Cyprus, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden

Free
DCTS Enhanced
Algeria, Bolivia, Cape Verde, Congo - Brazzaville and 13 more

Algeria, 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 more

Antigua & 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 more

Anguilla, 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

last 12 months£90.6m+7.6% · previous 12 months
Average import price£3.30 per kg
Jan 2024: £8.5mFeb 2024: £10mMar 2024: £9mApr 2024: £8.3mMay 2024: £8.4mJun 2024: £10.1mJul 2024: £6.6mAug 2024: £9.7mSept 2024: £7mOct 2024: £6.1mNov 2024: £6.8mDec 2024: £8.5mJan 2025: £8.2mFeb 2025: £6.3mMar 2025: £8.2mApr 2025: £6.9mMay 2025: £6.9mJun 2025: £7.1mJul 2025: £6.5mAug 2025: £5.7mSept 2025: £7mOct 2025: £7.2mNov 2025: £7.4mDec 2025: £6.9mJan 2026: £8.7mFeb 2026: £7mMar 2026: £8.6mApr 2026: £8.3mMay 2026: £7.2mJun 2026: £7.9mJul 2026: £7.3mAug 2026: £7.2m 202420252026
Data up to August 2026 (provisional) · Monthly data: Eurostat Comext (CC BY 4.0), HMRC (OGL v3.0)

Main suppliers, last 12 months

CountryValueShareChange
Germany £53.5m 59.1% +46.8%
United States £21.8m 24% -13.2%
Italy £2.6m 2.8% -42%
Switzerland £2.2m 2.5% +43.5%
Belgium £1.6m 1.7% -37.3%
Netherlands £1.4m 1.5% -66.6%
France £1.3m 1.5% -38.9%
Poland £1m 1.2% -32.9%

Same subheading in other tariffs

World trade in 2024

3815.90 · US$4.6bn

Trade value (US$) no reported trade < US$760.4kUS$760.4k+US$14.7m+US$78.8m+> US$303.4m

Exports: 114
  1. United States: US$1.3bn
  2. Germany: US$989.2m
  3. Japan: US$391.5m
  4. China: US$303.4m
  5. Netherlands: US$203.5m
  6. United Kingdom: US$186.3m
  7. Italy: US$114.4m
  8. Denmark: US$111.8m
  9. India: US$100.6m
  10. France: US$95.4m
  11. Saudi Arabia: US$78.8m
  12. Canada: US$65.8m
  13. Belgium: US$64.2m
  14. Sweden: US$63.4m
  15. South Korea: US$49.8m
  16. Russia: US$43.5m
  17. Switzerland: US$42.2m
  18. Singapore: US$39.5m
  19. Brazil: US$39m
  20. Spain: US$36.6m
  21. Austria: US$32.6m
  22. Finland: US$28m
  23. Taiwan: US$23m
  24. Türkiye: US$22.6m
  25. Australia: US$17.7m
  26. Poland: US$17.4m
  27. South Africa: US$16.4m
  28. Hong Kong SAR China: US$14.7m
  29. Norway: US$14m
  30. Czechia: US$13.5m
  31. Thailand: US$11.8m
  32. Malaysia: US$10.7m
  33. Hungary: US$9.8m
  34. Mexico: US$9.7m
  35. Qatar: US$7.4m
  36. Indonesia: US$6m
  37. Vietnam: US$5.5m
  38. Greece: US$4.9m
  39. Iran: US$3.5m
  40. Argentina: US$3.4m
  41. Slovenia: US$3.3m
  42. Romania: US$3.2m
  43. Brunei: US$2.6m
  44. North Macedonia: US$2.5m
  45. Lithuania: US$2.5m
  46. Slovakia: US$2.3m
  47. Estonia: US$2.1m
  48. Portugal: US$1.9m
  49. Ireland: US$1.8m
  50. Kuwait: US$1.8m
  51. Bulgaria: US$1.6m
  52. United Arab Emirates: US$1.4m
  53. Colombia: US$1.2m
  54. Guatemala: US$1.1m
  55. Chile: US$760.4k
  56. Bahrain: US$642.8k
  57. Costa Rica: US$610.7k
  58. Kazakhstan: US$604.9k
  59. Serbia: US$598.4k
  60. Uzbekistan: US$575k

Top exporters

RankCountryValueShare
1 United States US$1.3bn 27.5%
2 Germany US$989.2m 21.5%
3 Japan US$391.5m 8.5%
4 China US$303.4m 6.6%
5 Netherlands US$203.5m 4.4%
6 United Kingdom US$186.3m 4.1%
7 Italy US$114.4m 2.5%
8 Denmark US$111.8m 2.4%
9 India US$100.6m 2.2%
10 France US$95.4m 2.1%

Top importers

RankCountryValueShare
1 China US$417m 9.1%
2 South Korea US$327.7m 7.1%
3 United States US$325.5m 7.1%
4 Indonesia US$233.2m 5.1%
5 Netherlands US$229.1m 5%
6 India US$198.8m 4.3%
7 Germany US$195.1m 4.2%
8 Canada US$160.6m 3.5%
9 Thailand US$158.4m 3.4%
10 Italy US$152.8m 3.3%

Binding rulings for similar goods 9

Decisions of U.S. Customs and Border Protection (CROSS) and HMRC (Advance Tariff Rulings) on goods classified here. A ruling binds only its holder, but shows how the authorities classify similar goods. The descriptions are the authorities’ own, in English.

  • N316688 U.S. CBP 7 January 2021 · 3815.90.50.00

    The tariff classification of cationic photoinitiators from Mexico

  • N295074 U.S. CBP 16 November 2018 · 3815.90.50.00

    The tariff classification of LESA 74070 and LESA 74071 from Canada or Mexico

  • H279271 U.S. CBP 30 April 2018 · 3815.90.30

    Application for Further Review of Protest No. 5309-15-100058; Nebula 20

  • N282368 U.S. CBP 13 January 2017 · 3815.90.30.00

    The tariff classification of “NC-25” from Japan Correction to Ruling Number N281144

  • N281144 U.S. CBP 15 December 2016 · 3815.90.50.00

    The tariff classification of “NC-25” from Japan

  • N280932 U.S. CBP 7 November 2016 · 3815.90.50.00

    The tariff classification of “Mn-OCTOATE 8%” from Japan.Correction to Ruling Number N280253

9 rulings in total for this code

The UK Global Tariff divides subheading 3815.90 into 16 tariff lines; the duty is between 0% and 6% (average 5.6%). 1 of them is duty-free.

In the EU Combined Nomenclature, subheading 3815.90 covers 2 tariff lines and the duty is between 0% and 6.5%. 1 of them is duty-free.

174 countries pay no duty in the UK thanks to trade agreements and preference schemes such as DCTS Comprehensive and European Union, against a standard rate of Free – 6%.

In the UK, additional duty of 35% applies on top of the customs duty to goods from Belarus and Russia.

Imports of other catalytic preparations into the UK came to £90.6m between September 2025 and August 2026 (up 8% on the year before); Germany supplied 59%, followed by United States.

In 2024, countries exported other catalytic preparations worth US$4.6bn (−4.4% year on year).

The largest exporter was the United States (US$1.3bn), followed by Germany.

Questions and answers

What is the HS code for reaction initiators, reaction accelerators and catalytic: other?

Reaction initiators, reaction accelerators and catalytic: other fall under HS subheading 3815.90, part of heading 3815, in section VI of the Harmonized System.

What is the import duty on reaction initiators, reaction accelerators and… in the UK?

Under the UK Global Tariff, imports under 3815.90 from countries without a preferential agreement are charged at 0% to 6%, depending on the line. Preferential rates, anti-dumping duties and VAT are not included.

What is the import duty on reaction initiators, reaction accelerators and… in the EU?

Under the EU Combined Nomenclature, imports under 3815.90 from countries without a preferential agreement are charged at 0% to 6.5%, depending on the line. Preferential rates, anti-dumping duties and VAT are not included.

Which country exports the most reaction initiators, reaction accelerators and…?

The United States, with US$1.3bn in 2024 (27.5% of world exports).

Which countries can export other catalytic preparations 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 Free – 6% applies. Pick a country above to see its rate.

Is there anti-dumping duty on other catalytic preparations?

The UK charges additional duty of 35% on goods from Belarus and Russia. Lower rates apply to the named exporters listed in the measure.

Where does the UK import other catalytic preparations from?

In the 12 months to August 2026, the largest suppliers were Germany (59%), United States (24%) and Italy (3%), out of total imports of £90.6m.