| Section2 = | Section3 = }} Bromochlorodifluoromethane, also known by the trade name Halon 1211, or BCF, or Halon 1211 BCF, or Freon 12B1,'s a haloalkane with the chemical formula's CF2ClBr. Brominated haloalkanes were first used during World War II as fire extinguisher for aircraft and tanks. Bromochlorodifluoromethane was introduced as an effective gaseous fire suppression agent around 1973 for use around highly valuable materials in places such as museums, mainframe rooms and telecommunica… (More on Bromochlorodifluoromethane)