Types of Fire Extinguishants

Methyl Bromide

This extinguisher boils at 4.6°C and was used for the protection of power plants in older aircraft.  It is toxic and should not be used in confined spaces, flight crew compartments or passenger cabins.  This extinguisher is no longer listed.  Existing bottles may be maintained but refills will not be made with Methyl Bromide.

Bromochlorodifluoromethane (BCF)

This semi-toxic extinguisher is particular effective against electrical and flammable liquid fires.  It is used in power plant systems, and for the protection of auxiliary power units in some aircraft.  It is also used in certain types of portable extinguisher.  It becomes gaseous at normal temperatures and condenses to liquid at -4°C (25°F), and can be stored and discharged at moderate pressures.  It has little or no corrosive effect, although halogen acids will be formed if its products which have been decomposed by fire comes into contact with water, eg. condensation caused by fire.  In contact with fire, BCF volatilizes instantly, giving rapid flame extinction with little or no harmful effect on metallic, wooden, plastic or fabric materials.

Also known as Halon 1211.

Bromotrifluoromethane (BTM)

This semi-toxic extinguishant is used for the protection of power plant and APUs.  It is also widely used in cargo compartment fire suppression systems of some types of aircraft.

Also known as Halon 1301.  It has a boiling point of -58°C.