9902.11.49 - Poly(1,6-diisocyanatohexane)-block-polyethylene-block-poly (1-butoxypropan-2-ol) (CAS no. 125252-47-3) (provided for in subheading 3911.90.90)

This HTS category, 9902.11.49, specifically addresses Poly(1,6-diisocyanatohexane)-block-polyethylene-block-poly(1-butoxypropan-2-ol), identified by CAS number 125252-47-3. This classification falls under Chapter 99 of the Harmonized Tariff Schedule, which pertains to temporary legislation, modifications proclaimed pursuant to trade agreements, and additional import restrictions. The inclusion of this specific chemical compound within Chapter 99 signifies that its import may be subject to special provisions, potential quantitative limitations, or specific duty rates beyond those established in the primary chapters of the HTS.

Unlike the broad coverage of live animals found in sibling categories such as 0101 (Live horses) or 0102 (Live bovine animals), this category is highly specific to a particular synthetic polymer. Its purpose is not for the general trade of commodities but rather for items regulated under temporary or specific import control measures. The reference to subheading 3911.90.90 indicates its underlying material classification within the broader plastics and articles thereof chapter, but its placement in Chapter 99 highlights the superimposed regulatory framework governing its entry into the customs territory.

As a leaf node, this category does not have further subcategories. Therefore, classification within 9902.11.49 relies directly on the precise identification of the product as Poly(1,6-diisocyanatohexane)-block-polyethylene-block-poly(1-butoxypropan-2-ol). Importers must ensure that the imported merchandise precisely matches the chemical description and CAS number to be correctly classified under this provision. Adherence to any specific documentation or licensing requirements associated with Chapter 99 provisions is also paramount for compliant importation.