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U.S. exports of polymeric mdi (crude mdi / polymeric methylene diphenyl diisocyanate), primary forms (HS 390931) totaled $42.8M in July 2026.
Importers of Polymeric MDI (Crude MDI / Polymeric Methylene Diphenyl Diisocyanate), Primary Forms paid $3.0M in duties in July 2026 — an effective duty rate of 13% on $24.3M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataPolymeric MDI — also known as crude MDI or PMDI — is the principal isocyanate used in rigid polyurethane foam insulation for construction and appliances, as well as in wood binders for oriented strand board (OSB). All US imports are classified under a single 10-digit line (3909310000). Hungary and Germany are the leading suppliers, reflecting the concentration of large-scale MDI production in European facilities operated by major global chemical companies. Importers should note that isocyanates are subject to EPA TSCA reporting requirements and OSHA hazard communication standards.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
222 shipments/mo
Importers should verify the current status of any trade-remedy orders at the time of entry, as antidumping and countervailing duty investigations can be initiated or modified. Hungary and Germany are the leading sources; EU-origin goods are not subject to Section 301 tariffs, but other trade-remedy actions should be checked with a licensed customs broker.
Beyond standard customs entry documents, importers must provide a Safety Data Sheet (SDS) compliant with OSHA HazCom standards. Polymeric MDI is also subject to EPA TSCA Section 8(a) Chemical Data Reporting rules if import thresholds are met. Carriers and freight forwarders will require proper hazardous materials labeling under DOT regulations for transport.
HSChapter 39
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Subheading 2 of 6 in heading 3909
Subheading 390931 · $20.6M of $106.5M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3909310000 | Poly(methylene Phenyl Isocyanate)(crudemdi,Polymer | $36.0M | 20.91% | 128.47% | $7.5M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3909310000 | Poly(methylene Phenyl Isocyanate)(crudemdi,Polymer | $42.2M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$20.6MYoY · Pro
Exports
$42.8MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
Canada and Mexico together take 79% of it.
customs district
origin
entry
rate provision · imports
5.1% enters free of duty; the effective duty rate is 14.80%.