2929.10.35.00 - 1,6-Hexamethylene diisocyanate

This HTS code specifically classifies 1,6-Hexamethylene diisocyanate (HDI). HDI is an aliphatic diisocyanate characterized by its six-carbon linear chain with isocyanate groups at each end. It is primarily used in the production of polyurethanes, particularly for coatings, adhesives, sealants, and elastomers where properties like UV stability, flexibility, and chemical resistance are desired.

Distinguishing 1,6-Hexamethylene diisocyanate from its sibling categories involves recognizing its aliphatic nature and specific chemical structure. For instance, while other sibling categories cover aromatic diisocyanates like toluenediisocyanates (TDIs) and bitolylene diisocyanate (TODI), or other specialized isocyanates like N-butylisocyanate, HDI is differentiated by its non-aromatic structure and the presence of a six-carbon alkane bridge. This structural difference leads to distinct performance characteristics in polyurethane applications, such as enhanced weatherability compared to aromatic isocyanates.

As this classification is a leaf node, there are no further subcategories. The classification ends with the specific identification of 1,6-Hexamethylene diisocyanate, signifying that further breakdown within this HTS code is not necessary. This precise classification ensures accurate duty assessment and trade statistics for this particular chemical compound.