2910 - Epoxides, epoxyalcohols, epoxyphenols and epoxyethers, with a three-membered ring, and their halogenated, sulfonated, nitrated or nitrosated derivatives:

This HTS category, 2910, encompasses a specific group of organic compounds characterized by the presence of an epoxide functional group – a three-membered ring containing one oxygen atom and two carbon atoms. These are referred to as epoxides, epoxyalcohols, epoxyphenols, and epoxyethers. The classification extends to derivatives of these compounds that have been chemically modified through halogenation, sulfonation, nitration, or nitrosation. The core structural feature of a three-membered ring is crucial for inclusion in this heading, distinguishing these compounds from other organic chemicals based on different functional groups.

Within the broader Chapter 29, which covers organic chemicals, this heading is distinct from other chapters that might contain related substances. For instance, it does not encompass epoxy resins (which are typically classified under Chapter 39, Plastics and articles thereof) or inorganic compounds containing oxygen. The focus here is strictly on the defined organic epoxide structures and their specific derivatives.

The subcategories within HTS 2910 further refine the classification by identifying key individual compounds and a general "Other" category. For example, specific headings are allocated to widely used epoxides like Oxirane (Ethylene oxide) and Methyloxirane (Propylene oxide), as well as important industrial chemicals such as 1-Chloro-2,3-epoxypropane (Epichlorohydrin). These specific listings ensure precise tariff treatment for significant commercial products, while the "Other" category accommodates less common or proprietary epoxide derivatives that fall within the general description of heading 2910.