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... chlorofluorocarbons are highly effective refrigerants that were developed in response to the pressing need to eliminate toxic and flammable substances, such as sulfur dioxide and ammonia, in refrigeration units and air conditioners. The most common commercial chlorofluorocarbons, marketed under the trade name Freon , are trichlorofluoromethane (chlorofluorocarbon-11) and dichlorodifluoromethane (chlorofluorocarbon-12). Commercial chlorofluorocarbons are nonflammable, noncorrosive, nontoxic, and odorless, and their vapor pressures and heats of vaporization made them very suitable for refrigeration applications. They were also widely used as aerosol propellants, cleansing agents for electrical and electronic components, and foaming agents in shipping-plastics manufacturing.
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