Polymeric Diphenylmethane Diisocyanate (PMDI) from Canada
PMDI is a polymeric form of MDI containing oligomeric isocyanate species with higher functionality, still classified under HTS 2929.10.80.10 due to its predominant isocyanate nitrogen functions. It is widely used in rigid polyurethane foam production for insulation and construction applications.
Duty Rate — Canada → United States
16.5%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Provide oligomer distribution analysis to distinguish PMDI from monomeric MDI and confirm 2929 classification over mixtures
• Comply with TSCA pre-manufacture notification if introducing new PMDI variants into U.S. commerce
• Use nitrogen-blanketed containers to prevent premature polymerization from atmospheric moisture exposure