1,1-Dibromo-2,2-difluoroethene430-85-3100 % similar 1-Bromo-1,2,2-trifluoroethene598-73-244 % similar Tetrafluoroethylene116-14-342 % similar Polytetrafluoroethylene9002-84-042 % similar 2-Bromo-1,1,3,3,3-pentafluoro-1-propene431-49-235 % similar Hexafluorobutadiene685-63-233 % similar