2903.77.00.20 - Trichlorotrifluoroethanes

This HTS category, 2903.77.00.20, specifically covers trichlorotrifluoroethanes. These are organic compounds belonging to the group of halogenated hydrocarbons, characterized by having three chlorine atoms and three fluorine atoms attached to an ethane backbone. Their primary application historically has been as refrigerants and propellants, although their use is now restricted due to environmental regulations concerning ozone depletion.

Distinguishing this classification from its siblings, we focus on the precise halogenation of the ethane molecule. While 2903.77.00.10 covers trichlorofluoromethane (a methane derivative), and other siblings like dichlorodifluoromethane and dichlorotetrafluoroethane represent different combinations and numbers of chlorine and fluorine atoms on an ethane base, this category is exclusively for compounds with a 3:3 chlorine-to-fluorine ratio on the ethane structure. The "Other" category (2903.77.00.80) serves as a catch-all for any remaining perhalogenated ethane derivatives with only fluorine and chlorine that do not fit the specific sibling descriptions.

As this node is a leaf node, there are no further subdivisions within the HTS for trichlorotrifluoroethanes. Classification at this level requires confirming the chemical identity and the exact number of chlorine and fluorine atoms present on the ethane molecule, as this determines its placement within the "Other, perhalogenated only with fluorine and chlorine" grouping.