Polymeric Diphenylmethane Diisocyanate (PMDI)
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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If when supplied as crude MDI containing significant polymeric content with impurities
Crude or technical grade MDI with non-stabilizer impurities may classify as chemical preparations in 3824 rather than pure isocyanates.
If fully polymerized into polyurethane prepolymer with excess isocyanate
Prepolymers where MDI has reacted with polyols shift to primary plastic materials classification under Chapter 39.
If for sulfur-containing isocyanate analogs
Organo-sulfur compounds with isocyanate functions classify under heading 2930 instead of 2929.
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Import Tips & Compliance
• 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
Related Products under HTS 2929.10.80.10
Methylenedi-p-Phenylene Isocyanate (MDI)
MDI is a diisocyanate compound featuring two isocyanate (-NCO) functional groups attached to a methylene-bridged diphenyl structure, classifying it under HTS 2929.10.80.10 as an isocyanate with other nitrogen function. It is primarily used in the production of polyurethane foams, coatings, and adhesives due to its reactivity with polyols.
Monometric 4,4'-MDI (Pure Diphenylmethane-4,4'-Diisocyanate)
Pure 4,4'-MDI is the monomeric isomer of methylenedi-p-phenylene isocyanate, featuring isocyanate groups specifically at the para positions, falling under HTS 2929.10.80.10. It serves as a building block for high-performance polyurethanes in elastomers and coatings.
MDI Flakes (Stabilized Solid Form)
MDI flakes are solidified, stabilized methylenedi-p-phenylene isocyanate designed for easier handling and transport, classified under HTS 2929.10.80.10 as the pure compound with added stabilizer (Chapter Note 1(f)). Used in polyurethane systems requiring controlled reactivity.