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HSChapter 39
U.S. imports of polymeric mdi (crude mdi / polymeric methylene diphenyl diisocyanate), primary forms (HS 390931) totaled $19.8M in April 2026, traded with 19 countries.
Last updated: April 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.
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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.
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Monthly import values over time