Mixed-halogen acyclic derivatives — compounds bearing two or more distinct halogen elements such as chlorine and fluorine on the same carbon chain — include the commercially significant hydrochlorofluorocarbon (HCFC) and hydrofluorocarbon (HFC) refrigerant families, as well as halons used in fire suppression. The presence of multiple halogens typically places these substances under both EPA ozone-depleting substance controls and, for HFCs, the AIM Act phasedown framework, creating a layered compliance environment. Importers must carefully distinguish the specific halogen combination and chain length to determine which regulatory regime and allowance system applies.

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