synthetic products, which do not occur naturally and contain chlorine and fluorine; commonly used in various industrial processes and as refrigerants and, prior to 1990, as a propellant gas for sprays; deplete ozone in the stratosphere and are powerful greenhouse gases
Chlorofluorocarbons or chlorinated fluorocarbons are artificially produced chemicals that are partly responsible for depletion of the ozone layer. CFCs have been used in refrigerants and a variety of other solvents since introduced in mid-1930.
One of the families of ozone depleting substances (ODS). Chemicals comprised of chlorine, fluorine and carbon. Their atmospheric lifetimes range from 55 to 1,700 years. Scientists have invented dozens of kinds of CFCs, but three dominate commerce: CFC-12, used in foams, aerosols, refrigeration, sterilization, and air conditioning; CFC-11, used in foams, aerosols and industrial refrigeration; and, CFC-113, used in solvents. The Montreal Protocol bans the consumption of newly-made CFCs outside Article 5 countries beginning January 1, 1996. Non-Article 5 countries, however, may produce 15% of their 1986 CFC production levels after this date, for essential domestic use and for export to Article 5 countries.
Chlorofluorocarbon gases that are released into the atmosphere as air pollutants and that change ozone to oxygen in the ozone layer
These are chemical compounds that are used as aerosol propellants, solvents and refrigerants. CFCs contribute to the depletion of the ozone layer and to the build-up of greenhouse gases.
Any of the various compounds consisting of chlorine, hydrogen, fluorine, and carbon. They were first invented by DuPont Corporation in 1928 and have been widely used as refrigerants, as aerosol propellants, as cleaning solvents and in the manufacture of plastic foam. In 1972, scientists discovered that gaseous CFCs can deplete the ozone layer when they slowly rise into the stratosphere and their chlorine atoms react with ozone molecules. Efforts are now underway through the Montreal Protocol to reduce and then eliminate production of this substance worldwide.
A class of compounds, used as refrigerants and in other chemical processes, which deplete the ozone layer in the stratosphere.
Chlorofluorocarbons (Ozone depleting gas widely used as aerosols and refrigerants).
Chlorofluorocarbons. A type of chemical compound made up of chlorine, fluorine and carbon. CFCs were suspected of being a factor in ozone depletion. The chemicals were used in refrigeration and cleaning products, among other things, before being effectively banned by the Montreal Protocol, an international treaty on ozone depletion.
(Chlorofluorocarbons): The first and probably most well known example of a group of chemical compounds that are responsible for the depletion of the ozone layer.
Any of various compounds consisting of carbon, hydrogen, chlorine and fluorine. CFCs are widely produced by aerosol spray products and refrigerants, and are a major cause of the greenhouse effect that traps harmful radiant energy close to the earth's surface.
synthetic compounds used as coolants in refrigerators and air conditioners, as solvents, and as a blowing agent to produce foam. Composed of chlorine, fluorine and carbon. CFCs are suspected of causing ozone depletion in the stratosphere.
Chlorofluorocarbons, chemicals which result in a depletion of the ozone layer in the upper atmosphere.
These and some other related chemicals have been used in great quantities in industry, for refrigeration and air conditioning. When released into the air, they rise into the high atmosphere and reduce the ozone layer.
chlorofluorocarbons, ozone-depleting gases used as refrigerants.
Any of a number of substances consisting of chlorine, fluorine, and carbon. CFCs are used for refrigeration, foam packaging, solvents, and propellants. They are proven to cause depletion of the atmosphere's ozone layer.
Chlorofluorocarbons are industrial solvents and materials that both deplete the ozone layer and contribute to the greenhouse effect. The production of this chemical is now controlled by an international agreement to protect the ozone layer.
chlorofluorocarbon compounds, such as Freon-12, used chiefly as refrigerants and as propellants was prohibited in 1979 because of their depleting effect on ozone in the atmosphere. a
(chlorofluorocarbons) Organic compounds made up of atoms of carbon, chlorine, and fluorine. They had widespread uses in many applications, including refrigeration and air conditioning, or the blowing of insulation foams, because their exceptional qualities : for example, their chemical stability make them particulary unreactive and safe. But the side effect of this chemical stability is to allow them, when released, to eventually reach the stratosphere and to be degraded there by strong UV radiation and give rise to ozone-depleting by-products
chlorofluorocarbons and hydrochlorofluorocarbons. Chlorine based chemicals that contribute to the depletion of the stratospheric ozone layer.
(chlorofluorocarbons) A class of human-made chlorine compounds that destroys the atmospheric ozone that protects life on land from damaging ultraviolet radiation.
Chemicals used in industry for refrigeration and air conditioning, and in consumer products. CFCs and their relatives, when released into the air, rise into the stratosphere, a layer of the atmosphere high above the Earth. In the stratosphere, CFCs and their relatives take part in chemical reactions which result in reduction of the stratospheric ozone layer, which protects the Earth's surface from harmful effects of radiation from the sun. The 1990 Clean Air Act includes provisions for reducing releases (emissions) and eliminating production and use of these ozone-destroying chemicals.
chlorofluorocarbons; used in refrigerators, aerosol cans and fire extinguishers; these chemicals move slowly from the lower atmosphere into the upper atmosphere where they destroy the ozone
compounds whose molecules contain atoms of carbon, chlorine and fluorine bonded together in various proportions. CFCs were used as refrigerants, propellants for aerosol spray cans, foaming agents, solvents and cleaning fluids. Because they are so inert and very stable, CFCs have atmospheric lifetimes in excess of 50 years. They are broken up in the stratosphere by UV radiation, producing free chlorine atoms which can destroy ozone. CFCs are also important greenhouse gases.
Chlorofluorocarbons, a family of manufactured gases composed of chlorine, fluorine, and carbon, which, along with halons, are the main cause of stratospheric ozone depletion.
Gases formed of chlorine, fluorine and carbon whose molecules normally do not react with other substances; they are therefore used as spray can propellants because they do not alter the material being sprayed.