Halon 1211 is a trade name for Bromochlorodifluoromethane. It is also known as BCF,Halon 1211 BCF, or Freon 12B1. The chemical formula is CF2ClBr.
It was introduced as an effective gaseous fire suppression agent in the 1960s for use around highly valuable materials in places such as museums, mainframe rooms, and telecommunication switching centers. The production of Bromochlorodifluoromethane and similar Chlorofluorcarbons has been banned in most countries since January 1, 1994 as part of the Montreal Protocol on ozone depleting substances.
This is a volatile extinguishant that should be used only with a breathing apparatus (when volume exceeds 5%).
See also: Halon 1301, fire extinguisher
