Subheading · Chapter 39 · Heading 3909

3909.31

3909.31: Poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI)

Polymeric MDI (crude MDI)

3909.31 is the HS subheading for polymeric MDI (crude MDI), under heading 3909 in chapter 39.

What you pay

Importing into UK

Customs duty 6% standard rate depends on the country of origin
Additional duties and charges 3 additional measures Import requirements: 2
VAT 20.00 % import VAT
Duty calculatorCalculate duty and taxes →

Rates by national line · UK Global Tariff

UK lines →
  1. 3909 31 00 00 Poly(methylene phenyl isocyanate) (crude mdi, polymeric mdi) 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 3

  • Additional dutyAdditional duties 35%
    Applies to goods from
    Belarus, Russia
    Legal act
    2022 No. 833
    Documents
    • 9018
  • Duty suspensionAutonomous tariff suspension Free
    Applies to goods from
    all countries
    In force
    until 31 December 2026
    Legal act
    2020 No. 1435
    Documents
    • 9Y12
  • 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

Import requirements 2

  • 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 - 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

Preferential rates by country

Agreement or schemeCountriesRate
standard rate (no agreement)—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£203.1m+3% · previous 12 months
Average import price£1.66 per kg
Jan 2024: £15.8mFeb 2024: £17mMar 2024: £17mApr 2024: £16.6mMay 2024: £18.2mJun 2024: £20.7mJul 2024: £17.2mAug 2024: £17.2mSept 2024: £16.5mOct 2024: £18.6mNov 2024: £16.9mDec 2024: £8.9mJan 2025: £17.3mFeb 2025: £17.5mMar 2025: £17.6mApr 2025: £17.5mMay 2025: £17.7mJun 2025: £17.2mJul 2025: £17mAug 2025: £14.5mSept 2025: £15.5mOct 2025: £15.9mNov 2025: £13.9mDec 2025: £7.4mJan 2026: £14.2mFeb 2026: £15.4mMar 2026: £16.1mApr 2026: £17.2mMay 2026: £22.5mJun 2026: £24mJul 2026: £22mAug 2026: £19.1m 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
China £56.8m 28% +25.4%
Belgium £49.6m 24.4% -6.1%
Netherlands £40.6m 20% +24.5%
Germany £39.2m 19.3% -26.5%
South Korea £4.9m 2.4% +163.8%
Hungary £4.6m 2.3% -26.2%
Portugal £3.2m 1.6% +30.5%
Saudi Arabia £1.5m 0.7% +993%

Same subheading in other tariffs

World trade in 2024

3909.31 · US$9bn

Trade value (US$) no reported trade < US$581kUS$581k+US$7m+US$279m+> US$1bn

Exports: 92
  1. China: US$2bn
  2. Germany: US$1bn
  3. Belgium: US$1bn
  4. South Korea: US$723m
  5. Netherlands: US$609m
  6. Hungary: US$540m
  7. Saudi Arabia: US$517m
  8. United States: US$478m
  9. Japan: US$385m
  10. Portugal: US$279m
  11. Spain: US$234m
  12. Türkiye: US$140m
  13. Italy: US$42m
  14. Singapore: US$37m
  15. France: US$33m
  16. Poland: US$31m
  17. United Arab Emirates: US$18m
  18. Vietnam: US$18m
  19. Ireland: US$12m
  20. India: US$10m
  21. Malaysia: US$9m
  22. Denmark: US$8m
  23. Canada: US$7m
  24. Czechia: US$7m
  25. United Kingdom: US$7m
  26. Taiwan: US$6m
  27. Greece: US$5m
  28. Brazil: US$4m
  29. Russia: US$4m
  30. Lithuania: US$4m
  31. Latvia: US$3m
  32. Colombia: US$3m
  33. Thailand: US$3m
  34. Kazakhstan: US$3m
  35. Panama: US$2m
  36. Egypt: US$2m
  37. Sweden: US$2m
  38. South Africa: US$2m
  39. Austria: US$2m
  40. Romania: US$1m
  41. Finland: US$1m
  42. Slovenia: US$1m
  43. Hong Kong SAR China: US$926k
  44. Australia: US$919k
  45. Mexico: US$608k
  46. Switzerland: US$581k
  47. Iran: US$571k
  48. Peru: US$452k
  49. Indonesia: US$380k
  50. St Barthélemy: US$289k
  51. British Virgin Islands: US$289k
  52. Estonia: US$269k
  53. Norway: US$258k
  54. Chile: US$248k
  55. Slovakia: US$176k
  56. Luxembourg: US$167k
  57. Tunisia: US$161k
  58. Kuwait: US$147k
  59. Croatia: US$141k
  60. Cameroon: US$79k

Top exporters

RankCountryValueShare
1 China US$2bn 25.3%
2 Germany US$1bn 13.7%
3 Belgium US$1bn 11.8%
4 South Korea US$723m 8.5%
5 Netherlands US$609m 7.1%
6 Hungary US$540m 6.3%
7 Saudi Arabia US$517m 6%
8 United States US$478m 5.6%
9 Japan US$385m 4.5%
10 Portugal US$279m 3.3%

Top importers

RankCountryValueShare
1 United States US$730m 8.5%
2 Netherlands US$548m 6.4%
3 Belgium US$510m 6%
4 Türkiye US$502m 5.9%
5 China US$495m 5.8%
6 Canada US$454m 5.3%
7 Russia US$402m 4.7%
8 India US$371m 4.3%
9 Poland US$356m 4.2%
10 Germany US$302m 3.5%

Import duty on this product around the world 152

The most-favoured-nation (MFN) duty each country applies to goods of this HS subheading: the average over its national tariff lines, with the lowest and highest line where they differ. Goods from countries with a trade agreement often pay less.

  • 5%median duty
  • 59number of duty-free countries (MFN)
  • 45%highest: Bahamas, Bermuda, Comoros

152

Importing countryMFN dutylines from – todata year
Albania 2% 2023
Algeria 5% 2023
Angola 0% 2023 · HS 2017
Anguilla 10% 2021 · HS 2017
Argentina 0% 2023 · HS 2017
Armenia 0% 2023
Australia 5% 2023
Azerbaijan 0% 2023 · HS 2017
Bahamas 45% 2022
Bahrain 5% 2023
Bangladesh 10% 2023 · HS 2017
Barbados 5% 2022 · HS 2017
Belarus 0% 2021 · HS 2017
Belize 0% 2023
Benin 5% 2023
Bermuda 25% 2023
Bhutan 10% 2022
Bolivia 10% 2023 · HS 2017
Bosnia & Herzegovina 5% 2022
Botswana 0% 2023
Brazil 14% 2023 · HS 2017
Brunei 0% 2023 · HS 2017
Burkina Faso 5% 2023
Burundi 0% 2023
Cambodia 0% 2023 · HS 2017
Cameroon 10% 2023
Canada 0% 2023
Cape Verde 5% 2023 · HS 2017
Central African Republic 10% 2023
Chad 10% 2023
Chile 6% 2023 · HS 2017
China 6.5% 2023
Colombia 0% 2023 · HS 2017
Comoros 20% 2021 · HS 2017
Congo - Brazzaville 10% 2023
Cook Islands 0% 2022 · HS 2017
Costa Rica 0% 2023
Côte d’Ivoire 5% 2023 · HS 2017
Cuba 10% 2023 · HS 2017
Dominica 0% 2023 · HS 2017
Dominican Republic 0% 2023
Ecuador 0% 2023 · HS 2017
Egypt 2% 2019 · HS 2017
El Salvador 0% 2022
Equatorial Guinea 10% 2023
Eswatini 0% 2023
Ethiopia 5% 2021 · HS 2017
European Union (27 countries) 6.5% 2023
Fiji 5% 2023
French Polynesia 13% 2023
Gabon 10% 2023
Gambia 5% 2023
Georgia 0% 2022 · HS 2017
Ghana 5% 2023
Gibraltar 12% 2023 · HS 2017
Guatemala 0% 2023
Guinea 5% 2023
Guinea-Bissau 5% 2023
Guyana 5% 2023 · HS 2017
Haiti 3.5% 2020 · HS 2017
Honduras 0% 2023
Hong Kong SAR China 0% 2023
Iceland 0% 2023
India 7.5% 2023
Indonesia 5% 2023
Iran 5% 2020 · HS 2017
Israel 0% 2022 · HS 2017
Jamaica 0% 2023
Japan 2.8% 2023
Jordan 0% 2023
Kazakhstan 0% 2023
Kenya 0% 2023
Kuwait 5% 2023
Kyrgyzstan 0% 2021 · HS 2017
Laos 5% 2023 · HS 2017
Lebanon 0% 2020 · HS 2017
Lesotho 0% 2023
Liberia 5% 2023
Libya 5% 2021 · HS 2017
Liechtenstein 2.5%* 2021 · HS 2017
Macao SAR China 0% 2023
Madagascar 5% 2023
Malawi 0% 2021 · HS 2017
Malaysia 0% 2023
Maldives 10% 0% – 20% 2023
Mali 5% 2023
Mauritania 5% 2023 · HS 2017
Mauritius 0% 2023
Mexico 3% 2023 · HS 2017
Micronesia 4% 2021 · HS 2017
Moldova 5% 2023 · HS 2017
Mongolia 5% 2023
Montserrat 0% 2023 · HS 2017
Morocco 7.5% 2.5% – 18% 2023
Mozambique 2.5% 2023
Myanmar (Burma) 1.5% 2023 · HS 2017
Namibia 0% 2023
Nauru 10% 2021 · HS 2017
Nepal 10% 2023
New Zealand 2.5% 0% – 5% 2023
Nicaragua 0% 2023
Niger 5% 2023
Nigeria 5% 2023
North Macedonia 5% 2023
Norway 0% 2023
Oman 5% 2023
Pakistan 0% 2023
Palestinian Territories 0% 2017 · HS 2017
Panama 0% 2023
Papua New Guinea 0% 2023
Paraguay 14% 2023 · HS 2017
Peru 6% 2023 · HS 2017
Philippines 5% 3% – 7% 2023
Qatar 5% 2023
Russia 0% 2021 · HS 2017
Rwanda 0% 2023
Samoa 8% 2020 · HS 2017
São Tomé & Príncipe 10% 2019 · HS 2017
Saudi Arabia 5% 2023
Senegal 5% 2023
Seychelles 0% 2023
Sierra Leone 5% 2023
Singapore 0% 2023 · HS 2017
Solomon Islands 10% 2023 · HS 2017
Somalia 5% 2023 · HS 2017
South Africa 0% 2023
South Korea 6.5% 2023
Sri Lanka 0% 2023
St Kitts & Nevis 0% 2023
St Pierre & Miquelon 5% 2021 · HS 2017
St Vincent & the Grenadines 0% 2023
Sudan 3% 2021 · HS 2017
Switzerland 2%* 2023
Tanzania 0% 2023
Thailand 4% 3% – 5% 2023
Togo 5% 2023
Tonga 15% 2023 · HS 2017
Türkiye 6.5% 2023
Tuvalu 0% 2017 · HS 2017
Uganda 0% 2023
Ukraine 5% 2023 · HS 2017
United Arab Emirates 5% 2023
United Kingdom 6% 2023
United States 6.5% 2023
Uruguay 0% 2023 · HS 2017
Uzbekistan 0% 2021 · HS 2017
Vanuatu 0% 2023
Venezuela 14% 2023 · HS 2017
Vietnam 3% 2023
Yemen 5% 2017 · HS 2017
Zambia 0% 2023
Zimbabwe 0.1% 2023

Tariff data years 2017–2023; rates may have changed since. * ad valorem equivalent of specific duties (UNCTAD estimate) · UNCTAD TRAINS, accessed via WITS (World Bank)

Classifications and correspondences

Where this HS subheading sits in the United Nations' statistical classifications, and which codes it had in earlier editions of the Harmonized System.

SITC Rev. 4
57543 Other amino resins
End use (BEC Rev. 5)
Intermediate goods · BEC 211210
CPC 2.1 product
34790 Other plastics in primary forms; ion exchangers
ISIC Rev. 4 activity
2013 Manufacture of plastics and synthetic rubber in primary forms

Earlier HS editions

HSCode
20173909.31unchanged
20123909.30changed
20073909.30changed
20023909.30changed
19963909.30changed
19923909.30changed

Correspondence tables of the United Nations Statistics Division (UNSD)

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.

  1. US Anti-dumping

    Methylene Diphenyl Diisocyanate From the People's Republic of China: Amended Final Determination of Sales at Less Than Fair Value and Antidumping Duty Order

    FR Doc. 2026-12771 · 91 FR 38393 · Source: federalregister.gov

  2. US Anti-dumping

    Methylene Diphenyl Diisocyanate From the People's Republic of China: Final Affirmative Determination of Sales at Less Than Fair Value

    FR Doc. 2026-07055 · 91 FR 18820 · Source: federalregister.gov

Rule changes →

Code history

Since 2017; before, these goods were classified under 3909.30.

Subheading 3909.31 is a single line in the UK Global Tariff, where the duty is 6%.

The EU Combined Nomenclature has one tariff line for subheading 3909.31; the duty is 6.5%.

Goods from 174 countries can enter the UK at a preferential rate instead of the standard 6%; 174 of them pay no duty at all, for example under DCTS Comprehensive or European Union.

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

In the 12 months to August 2026, the UK imported polymeric MDI (crude MDI) worth £203.1m (up 3% on the year before), at an average of £1.66 per kg; China supplied 28%, followed by Belgium.

World trade in polymeric MDI (crude MDI) reached US$9bn in 2024, up 5.2% on 2023.

China was the largest exporter with 25.3% of the total, ahead of Germany.

Questions and answers

What is the HS code for poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI)?

Poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI) fall under HS subheading 3909.31, part of heading 3909, in section VII of the Harmonized System.

What is the import duty on poly(methylene phenyl isocyanate) (crude MDI… in the UK?

Under the UK Global Tariff, imports under 3909.31 from countries without a preferential agreement are charged at 6%. Preferential rates, anti-dumping duties and VAT are not included.

What is the import duty on poly(methylene phenyl isocyanate) (crude MDI… in the EU?

Under the EU Combined Nomenclature, imports under 3909.31 from countries without a preferential agreement are charged at 6.5%. Preferential rates, anti-dumping duties and VAT are not included.

Which country exports the most poly(methylene phenyl isocyanate) (crude MDI…?

China, with US$2bn in 2024 (25.3% of world exports).

Which countries can export polymeric MDI (crude MDI) 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 6% applies. Pick a country above to see its rate.

Is there anti-dumping duty on polymeric MDI (crude MDI)?

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 polymeric MDI (crude MDI) from?

In the 12 months to August 2026, the largest suppliers were China (28%), Belgium (24%) and Netherlands (20%), out of total imports of £203.1m.

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