U.S. imports of Polymeric MDI (Crude MDI / Polymeric Methylene Diphenyl Diisocyanate), Primary Forms (HS 390931) totaled $82.5M in August 2026, imported from 20 countries.
Importers of Polymeric MDI (Crude MDI / Polymeric Methylene Diphenyl Diisocyanate), Primary Forms paid $8.5M in duties in August 2026, an average duty rate of 10.38% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Polymeric MDI (Crude MDI / Polymeric Methylene Diphenyl Diisocyanate), Primary Forms imports of $82.5M in August 2026 ran 197% above the year-to-date monthly average of $27.8M.
Last updated: August 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.
355 import shipments a month
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.
Subheading 1 of 6 in heading 3909
Subheading 390931 · $82.5M of $149.0M
ImportsExports
Imports
$82.5MYoY · free account
Exports
$39.4MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $297.2M of Polymeric MDI (Crude MDI / Polymeric Methylene Diphenyl Diisocyanate), Primary Forms and exported $516.8M.
Through August 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3909310000 | Poly(Methylene Phenyl Isocyanate)(Crudemdi, Polymer | $82.2M | 10.38% | 98.34% | $8.5M |
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 | $39.4M |
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.
Trade Directory
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Imports · August 2026
origin
Belgium and Hungary together supply 77% of it.
customs district
destination
entry
rate provision · imports
1.6% enters free of duty; duty collected equals 10.38% of imports for consumption.