1-Bromo-1,2,2-trifluoroethene598-73-2100 % similar 1,1-Dibromo-2,2-difluoroethene430-85-344 % similar Tetrafluoroethylene116-14-338 % similar Polytetrafluoroethylene9002-84-038 % similar 2-Bromo-1,1,3,3,3-pentafluoro-1-propene431-49-233 % similar Hexafluorobutadiene685-63-231 % similar