2903.77.00 - Other, perhalogenated only with fluorine and chlorine

This HTS category, 2903.77.00, encompasses halogenated derivatives of acyclic hydrocarbons that are perhalogenated exclusively with fluorine and chlorine. These compounds are characterized by the presence of both fluorine and chlorine atoms bonded to carbon atoms in an open chain structure, with no other halogen elements (such as bromine or iodine) or hydrogen atoms present. This specific combination of halogens, with no other substitutions, defines their unique chemical properties and applications.

This classification is distinct from its sibling categories, which primarily deal with hydrochlorofluorocarbons (HCFCs) containing only chlorine and fluorine, or specific named HCFC compounds like Chlorodifluoromethane (HCFC-22) or Dichlorotrifluoroethanes (HCFC-123). While sharing the commonality of being halogenated acyclic hydrocarbons with fluorine and chlorine, the 2903.77.00 group is distinguished by its "perhalogenated only with fluorine and chlorine" specification, implying a higher degree of halogenation without hydrogen, and potentially differentiating it from certain HCFCs that may still retain some hydrogen.

The subcategories within 2903.77.00 provide further specificity for classifying particular compounds based on their chemical formula and structure. These subdivisions, such as Trichlorofluoromethane and Trichlorotrifluoroethanes, allow for precise identification of specific perhalogenated fluorocarbons. The existence of these subcategories highlights the importance of detailed chemical nomenclature and structural understanding for accurate customs classification within this group.