Freon is a trade name for a group of chlorofluorocarbons used primarily as a refrigerant. The word Freon® is a registered trademark belonging to E.I. du Pont de Nemours & Company. Prior to their implication as a major contributor to the greenhouse effect, freons were also used as aerosol propellants and to foam up polymer materials. It is also implicated, along with other chlorofluorcarbons, in the depletion of the ozone layer, which protects against UV radiation.
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