fully fluorinated carbon atom
(B) Definitions In this paragraph: (i) Fully fluorinated carbon atom The term “fully fluorinated carbon atom” means a carbon atom on which all the hydrogen substituents have been replaced by fluorine. (ii) Perfluoroalkyl substance The term “perfluoroalkyl substance” means a chemical of which all of the carbon atoms are fully fluorinated carbon atoms. (iii) Polyfluoroalkyl substance The term “polyfluoroalkyl substance” means a chemical containing at least one fully fluorinated carbon atom and at least one carbon atom that is not a fully fluorinated carbon atom.