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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If blended with polyols or other additives for direct polyurethane system use
Mixtures containing MDI with additional components beyond stabilizers fall under Chapter 38 as chemical preparations rather than pure isocyanates.
If pre-reacted with polyols into polymeric MDI or polyurethane prepolymers
Reaction products forming polyurethanes or prepolymers are classified as polypeptide/polysaccharide derivatives in heading 3504, not pure isocyanates.
If for aromatic polyamines used as MDI precursors rather than the isocyanate itself
Precursor diamines like diaminodiphenylmethane lack the isocyanate nitrogen function and classify under aromatic amines of heading 2921.
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Import Tips & Compliance
• Verify purity and isocyanate content via certificate of analysis to confirm classification under 2929.10.80.10 and avoid misclassification as mixtures
• Include safety data sheets (SDS) documenting isocyanate hazards for DOT and EPA compliance during transport and handling
• Ensure proper stabilization packaging to prevent moisture reaction, a common pitfall leading to shipment rejection
Related Products under HTS 2929.10.80.10
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.
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.