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Halon
Three types of Halon gas were used for extinguishing fires, though all have now been
prohibited by the Montreal protocol as they were found, along with other chemicals, to be destroying the Earth's ozone layer.
Each Halon has a four-digit designation that indicates, respectively,
the number of fluorine, bromine and chlorine atoms they have and their base hydrocarbon group. The three types are
| Halon | Fluorine | Bromine | Chlorine | Alkane Base | |
|---|---|---|---|---|---|
| Methane | Ethane | ||||
| 1301 (tribromofluoro- methane) | 1 | 2 | yes | ||
| 2402 (tetrabromodifluoro- ethane) | 2 | 4 | yes | ||
| 1211 (dibromofluorochloro- methane) | 1 | 2 | 1 | yes | |