Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. organic material
7. chlorofluorocarbon

Anotations

Scope note:

Generic name for any of a class of compounds formerly used as a fire-extinguishing agent. When exposed to flame, these chlorofluorocarbon gases release halogen atoms which interact with hydrogen atoms, suppressing combustion in the process. They also deplete the earth's ozone when exposed to solar ultraviolet light and have consequently been withdrawn from use. Included in the group are Halon: dichlorodifluoromethane, CCl2F2; Halon 1211: bromochlorodifluoromethane, CBrClF2; and Halon 1301: trifluorobromomethane, CBrF3.