Also known as: Chlorofluorocarbons, CFCs, Halons. Other names include: Fluorotrichloromethane, Dichlorodifluoromethane, Trichlorotrifluoroethane, Bromochlorodifluoromethane, Dibromotetrafluoroethane, Chlorodifluoromethane.

Freons are colorless liquids or gases. Freons were used as coolants or pressurizers in spray can products, including drugs. In the 1970s, scientists discovered that these chemicals were destroying the earth's ozone layer. This was allowing potentially dangerous levels of ultraviolet light to reach the earth. The making and use of freons is now restricted, and freons are being replaced by safer chemicals.

Freons are gases at normal room temperature, liquids when cooled or compressed. Spilled liquid freons do not remain at the spill site for more than a few minutes before they evaporate. If liquid freons leak into soil before evaporation, they can seep into groundwater.

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Last Revised: December 30, 2015