Hexafluorobutadiene685-63-2100 % similar Tetrafluoroethylene116-14-350 % similar 2-Chloropentafluoro-1,3-butadiene392-42-750 % similar Polytetrafluoroethylene9002-84-050 % similar 1,1-Dibromo-2,2-difluoroethene430-85-333 % similar Fluoranil527-21-933 % similar Iodotrifluoroethylene359-37-531 % similar 1-Bromo-1,2,2-trifluoroethene598-73-231 % similar Polychlorotrifluoroethylene9002-83-931 % similar