Code 3909 31 · Heading 3909

Poly(methylene phenyl isocyanate) (raw MDI), in primary form

This code covers poly(methylene phenyl isocyanate), also called raw MDI, when supplied in primary form. It does not cover other aminoplasts, phenol plastics or polyurethanes named separately in the tariff tree.

For example

Raw MDI in primary form

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See the official tariff text

Official tariff text

Poly"methylene phenyl isocyanate" "crude MDI, polymeric MDI", in primary forms

The path to this code

Every code is reached through these choices, one level at a time.

Step 4 of 4

Step 1 · Section VII Plastics and articles thereof; rubber and articles …
Is the product made of plastic, or is it made of rubber?
✓
Step 2 · Chapter 39 Plastics and articles thereof 1 of 2 chapters in section VII
What kind of plastic product is it: an unworked polymer or ion exchanger, plastic waste, a monofilament, rod or profile, a pipe or hose, a floor or wall covering, a flat plastic form, a sanitary item, a transport or packaging item, a household or toilet item, building equipment, or another plastic article?
✓
Step 3 · Heading 3909 Amino-resins, phenolic resins and polyurethanes, in… 9 of 26 headings under chapter 39
Is it carbamide or thiocarbamide plastic, melamine plastic, poly(methylene phenylisocyanate) (raw MDI), another aminoplastic, phenoplastic, or polyurethane, all in unprocessed form?
✓
Step 4 · Subheading 3909 31 Poly"methylene phenyl isocyanate" "crude MDI, polym… 3 of 6 subheadings under heading 3909
Is the product poly(methylene phenyl isocyanate) (raw MDI) in primary form?

Full 8-digit codes

Pick the description that best matches your product.

1 code below this one

3909 31 00 Poly"methylene phenyl isocyanate" "crude MDI, polymeric MDI", in primary forms 6.5% Save

Compare the sibling codes

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

3909 10 Urea resins and thiourea resins, in primary forms 0.0%
3909 20 Melamine resins, in primary forms 6.5%
3909 31 Poly"methylene phenyl isocyanate" "crude MDI, polymeric MDI", in primary forms you are here 6.5%
3909 39 Amino-resins, in primary forms (excl. urea, thiourea and melamine resins and MDI) 6.5%
3909 40 Phenolic resins, in primary forms 6.5%
3909 50 Polyurethanes, in primary forms 0.0–6.5%

Export to Norway

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

39.09.3100

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

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. 3, 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.

3909 31 00 00

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

Ordinary duty

6.0%

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. 3, 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 6 codes at this level

Previous code 3909 20

Melamine resins, in primary forms

you are here 3909 31

Poly"methylene phenyl isocyanate" "crude MDI, polymeric MDI", in prim…

Next code 3909 39

Amino-resins, in primary forms (excl. urea, thiourea and melamine res…

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.