HS code 3909.31: Other amino-resins, poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI)
Last updated
Key facts
- HS code
- 3909.31
- Covers
- Other amino-resins, poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI)
- Edition
- HS2022
- Duty in the United States
- See its 1 line
Summary
HS code 3909.31 covers other amino-resins, poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI). It sits in heading 39.09 (amino-resins, phenolic resins and polyurethanes, in primary forms) in chapter 39 (plastics and articles thereof). Other goods of heading 39.09 are classified under 3909.10 (urea resins; thiourea resins), 3909.20 (melamine resins), 3909.39 (other amino-resins, other), 3909.40 (phenolic resins) or 1 other. National tariff lines under 3909.31 are live on border.bot for the United States (1 line, also used by 1 other country).
What this code covers
HS code 3909.31 covers other amino-resins, poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI).
The legal text of the subheading is “Other amino-resins: Poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI)”, read under “Other amino-resins”, in HS2022.
What it doesn’t cover
Other goods of heading 39.09 are classified under 3909.10 (urea resins; thiourea resins), 3909.20 (melamine resins), 3909.39 (other amino-resins, other), 3909.40 (phenolic resins) or 1 other.
How it is structured
3909.31 is a six-digit subheading. Its first two digits, 39, are the chapter; the first four, 3909, are heading 39.09; the last two, 31, identify the subheading within the heading.
Countries add their own digits after these six for their national tariff lines.
- Chapter 39
- Plastics and articles thereof
- Within the heading
- Other amino-resins
- Subheading 3909.31
- Poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI)
In other countries
National tariff lines under 3909.31 are live on border.bot for the United States (1 line, also used by 1 other country).
- United States1 line, used by 1 other country
Frequently asked questions
What does HS code 3909.31 cover?
HS code 3909.31 covers other amino-resins, poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI).
Which heading and chapter is HS code 3909.31 in?
HS code 3909.31 is in heading 39.09 (amino-resins, phenolic resins and polyurethanes, in primary forms) in chapter 39 (plastics and articles thereof).
Where are goods of heading 39.09 classified when 3909.31 doesn’t fit?
Other goods of heading 39.09 are classified under 3909.10 (urea resins; thiourea resins), 3909.20 (melamine resins), 3909.39 (other amino-resins, other), 3909.40 (phenolic resins) or 1 other.
Which countries’ tariffs list national lines under HS code 3909.31?
National tariff lines under 3909.31 are live on border.bot for the United States (1 line, also used by 1 other country).
Sources and updates
The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026.
This page was last updated on 11 October 2026.
Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.