9902.11.42 - Poly[oxy(methyl-1,2-ethanediyl)],α-hydro-ω-hydroxy- and 5- isocyanato-1-(isocyanatomethyl)-1,3,3- trimethylcyclohexane (Isophorone diisocyanate) (CAS No. 1012318-97-6) (provided for in 3909.50.50)

This HTS classification, 9902.11.42, pertains to a specific chemical compound: Poly[oxy(methyl-1,2-ethanediyl)], α-hydro-ω-hydroxy- combined with 5-isocyanato-1-(isocyanatomethyl)-1,3,3-trimethylcyclohexane, also known as Isophorone diisocyanate. This designation falls under Chapter 99, which covers temporary legislation and modifications, including those made pursuant to trade agreements and specific agricultural adjustment acts. The inclusion of the CAS number (1012318-97-6) and the parenthetical reference to HTS subheading 3909.50.50 indicates that this is a temporarily modified or specifically accounted for import related to polyurethanes or related chemical products, likely subject to specific duties or restrictions outside of the standard Harmonized System chapters.

Distinguishing this category from its siblings is crucial. The sibling categories provided, such as live animals (0101-0105), represent entirely different classes of goods, focusing on biological organisms. In contrast, HTS 9902.11.42 deals with specialized industrial chemicals. The context of Chapter 99 signifies that this classification is not about the inherent nature of the chemical itself as a commodity, but rather its temporary classification status due to specific trade policies, agreements, or agricultural measures. Therefore, its distinction lies not in its physical form or use in the same way as classifying different types of live animals, but in its unique regulatory treatment under specific trade provisions.

As HTS 9902.11.42 is a leaf node, it does not have subcategories. Classification at this level signifies a final, specific designation for this particular chemical compound under the temporary provisions of Chapter 99. The classification is precise, covering the defined chemical entity and its associated regulatory context. Importers should ensure that their documentation accurately reflects the chemical identity and the specific trade provisions under which this HTS code is applied, as deviations could lead to classification errors and potential customs delays or penalties.