Methylene Diphenyl Diisocyanate (MDI)
Methylene diphenyl diisocyanate (MDI) is a diisocyanate compound featuring two isocyanate (-N=C=O) groups attached to a diphenylmethane structure, classifying it under HTS 2929.10.80.90 as an 'other' isocyanate with nitrogen function. It is primarily used in the production of polyurethane foams, coatings, and adhesives.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If reacted with polyols to form polymeric MDI prepolymer
Polymerized isocyanates with molecular weight >500 Da shift to Chapter 39 as polyurethane prepolymers.
If blended with solvents or stabilizers exceeding Chapter 29 note (g) limits
Mixtures with additives rendering specific use suitability fall under chemical preparations in heading 3824.
If imported as carboxamide derivative rather than isocyanate
Structural analogs without isocyanate function classify under other cyclic amides in 2924.
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Import Tips & Compliance
• Obtain safety data sheets (SDS) and ensure proper Hazard Class 6.1 labeling for toxic liquid UN 2480 during transport
• Verify purity levels (>99%) via certificate of analysis to confirm classification as chemically defined compound under Chapter 29
• Avoid misclassification as polyurethane prepolymer; pure MDI must be imported without added polyols
Related Products under HTS 2929.10.80.90
Toluene Diisocyanate (TDI) 80/20 Mixture
TDI 80/20 is an 80:20 mixture of 2,4- and 2,6-toluene diisocyanate isomers, qualifying as 'other' isocyanates under HTS 2929.10.80.90 per Chapter 29 note (b) for isomer mixtures. Widely used for flexible slabstock polyurethane foams.
Xylidene Diisocyanate (XDI)
Xylidene diisocyanate (XDI), or xylylene diisocyanate, is a meta-xylylene-based diisocyanate classified in HTS 2929.10.80.90 as other isocyanates. It produces polyureas and coatings with excellent adhesion properties.
Methylenedi-p-tolyl Diisocyanate (MDT)
Methylenedi-p-tolyl diisocyanate (MDT or DET) contains two p-tolyl isocyanate groups linked by methylene, qualifying under HTS 2929.10.80.90 as other isocyanates. Used in specialty polyurethane elastomers.
Isophorone Diisocyanate (IPDI)
Isophorone diisocyanate (IPDI) is a cycloaliphatic diisocyanate with two -NCO groups, falling under HTS 2929.10.80.90 as an 'other' isocyanate compound with nitrogen function per Chapter 29 notes. It is valued for light-stable polyurethane coatings and elastomers.
Hexamethylene Diisocyanate (HDI)
Hexamethylene diisocyanate (HDI) is an aliphatic diisocyanate with the formula OCNC6H12NCO, classified in HTS 2929.10.80.90 as an 'other' isocyanate per Chapter 29 nitrogen function provisions. It produces flexible, UV-resistant polyurethanes for automotive clearcoats.
p-Phenylene Diisocyanate (PPDI)
p-Phenylene diisocyanate (PPDI), or 1,4-diisocyanatobenzene, contains two isocyanate groups on a benzene ring, classifying under HTS 2929.10.80.90 as other aromatic isocyanates. Used in high-temperature resistant polyurethanes and spandex fibers.