2903.78.00.00 - Other perhalogenated derivatives

The HTS subheading 2903.78.00.00 encompasses "Other perhalogenated derivatives" within the broader category of halogenated derivatives of acyclic hydrocarbons containing two or more different halogens. This designation specifically applies to compounds where all hydrogen atoms in the parent acyclic hydrocarbon have been replaced by halogen atoms (chlorine, fluorine, bromine, iodine), and the molecule contains at least two distinct types of halogens. These substances are typically synthetic compounds with unique chemical and physical properties often utilized as refrigerants, blowing agents, propellants, or solvents, where their specific halogen composition dictates their application.

This category serves as a residual grouping for perhalogenated acyclic hydrocarbons with multiple different halogens that are not specifically enumerated in preceding subheadings. For instance, while subheadings like 2903.71 to 2903.75 detail specific chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) with particular halogen and carbon chain structures, 2903.78.00.00 captures other perhalogenated derivatives that do not fit those precise definitions. The key distinguishing factor lies in the complete substitution of hydrogen by halogens and the presence of at least two different halogen elements within the molecule, differentiating them from partially halogenated compounds or those with only a single type of halogen.

As a leaf node within the HTS structure, subheading 2903.78.00.00 does not have further subcategories. Classification within this heading relies on a thorough analysis of the chemical structure of the product, confirming it is acyclic, fully halogenated, and contains at least two distinct halogen elements. Examples might include perfluorinated compounds containing chlorine or bromine, or mixed chloro-fluoro-bromo compounds that are not otherwise specified. The absence of further subdivisions underscores the importance of precise chemical identification to ensure accurate tariff classification.