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Chlorofluorocarbons (CFCs)
CFCs are a family of man-made gases used for various industrial
purposes. First developed in the 1920's in the United States, CFCs have
been used in large quantaties since 1950. The industrialized countries can
account for over 80% of CFCs use. CFC-11 is used primarily as a propellant
in aerosol cans, although its use has been phased out it is still used in
the production of plastic foams. CFC-12 is used in foam production as well
as cooling coals of refrigerators and air conditioners. HCFC-22 was
recently introduced as a replacement for CFC-12 because of its shorter ....
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