What chemicals are used in a fire extinguisher? How do they …
1999年4月5日 · Indeed, bromine and chlorine atoms are released as halons decompose in the heat of the fire, establishing a catalytic cycle involving HBr and HCl; the cycle converts active hydrogen atoms to ...
Bromotrifluoromethane - Wikipedia
Bromotrifluoromethane, commonly referred to by the code numbers Halon 1301, R13B1, Halon 13B1 or BTM, is an organic halide with the chemical formula C Br F 3. It is used for gaseous fire suppression as a far less toxic alternative to bromochloromethane. [3] Bromotrifluoromethane is commercially synthesized in a two-step process from chloroform.
Bromochlorodifluoromethane - Wikipedia
Bromochlorodifluoromethane (BCF), also referred to by the code numbers Halon 1211 and Freon 12B1, is a haloalkane with the chemical formula C F 2 Cl Br. It is used for fire suppression, especially for expensive equipment or items that could be damaged by the residue from other types of extinguishers. [1] .
Halogenated fire extinguishing systems that contain a Halon agent will inhibit the chemical reaction of fuel and oxygen, i.e., bromine, iodine and chlorine atoms can act catalytically to inhibit the chemical reaction, with each atom participating, thus stopping the combustion chain reaction.
aid fire suppression for incipient fires in materials adjacent to or in the same area as the oxidizers. Fires involving oxidizers are typically beyond the capability of portable fire extinguishers.
Halons are hydrocarbons in which one, or more, of the hydrogen atoms has been replaced by atoms of the halogen series, such as bromine, fluorine, chlorine, or iodine. Halon extinguishes fires by breaking the chain reaction of the combustion process.
LOGOS - NOAA Global Monitoring Laboratory - National Oceanic …
Halons are used primarily as fire extinguishing agents, both in built-in systems and in portable fire extinguishers. There have been some reported uses as tracers for studies of circulation both in the atmosphere and in buildings. All halons contain bromine which is 40-100 times more effective at destroying ozone than chlorine.
Halon | Fire Suppression, Ozone Depletion, Pollutant | Britannica
Halon 1301 (bromotrifluoromethane) is especially favoured for extinguishing fires involving electronic equipment because it leaves no residue and does not cause electrical short circuits or damaging corrosion of the equipment. Halons are both atmospheric ozone depleters and greenhouse gases.
What chemicals are used in a fire extinguisher? How do they
2018年7月9日 · Bromine and chlorine atoms decompose in the heat of the fire creating a catalytic cycle that involves HBr and HCl. This cycle converts active hydrogen atoms into stable H2 molecules breaking...
Recognizing and Preplanning Halon Replacement Agents - Fire Engineering …
2007年5月1日 · They extinguish fire by inhibiting the chemical chain reaction inside the flame zone. Halons are used on Class A, Class B, and Class C fires. Their major drawback, however, is that they contain...