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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as the corresponding diamine precursor (DADPM)
The diamine precursor lacks isocyanate groups and classifies as an aromatic monoamine under heading 2921.
If when diluted with inert solvents for safe transport
Solvent-dissolved MDI for transport safety (per Chapter Note 1(e)) remains in 2929, but excessive solvent may shift to mixtures in 3824.
If for related aromatic diacid derivatives
Oxidation products or acid derivatives of the diphenylmethane structure classify under oxygen-function carboxylic acids.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Include HPLC or GC analysis confirming >98% monomeric 4,4'-MDI content for accurate HTS verification
• Label containers with UN 2489 hazard class and ensure respiratory protection guidelines in import docs
• Avoid bulk shipments without temperature control, as monomeric MDI has lower stability than polymeric forms
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.
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.
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.