chlorofluorocarbons


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chlorofluorocarbons


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1. (CFCs) Compounds of chlorine and fluorine once much used as aerosol propellants and refrigerants, and in foam packaging; now known to deplete the ozone layer and act as greenhouse gases.
2. Compounds formed when some or all of the hydrogen atoms in a hydrocarbon have been replaced with chlorine and fluorine.
References in periodicals archive ?
Implemented in 1989, it banned ozone-depleting chemicals called chlorofluorocarbons worldwide.
Another SDPI expert Kashif Salik said Chlorofluorocarbons (CFCs) are greenhouse gases.
Chlorofluorocarbons (CFCs) are greenhouse gases," said SDPI environmentalist Kashif Salik.
As part of its commitment by Montreal Protocol concerning the non-use of substances that cause ozone depletion, in the beginning of this year the ministry limited the use of chlorofluorocarbons by setting specific rations for the companies that use this substance.
Summary: Chlorofluorocarbons are being used as coolants since the last more than fifty years, and their increasing concentration in atmosphere causes the ozone layer depletion, therefore to develop a sensor for detection of chlorofluorocarbons is environmentally significant.
ISLAMABAD, 06 June, 2009 (Balochistan Times) --Ministry of Environment, in collaboration with its partners is holding a Stakeholders Workshop on Hydro Chlorofluorocarbons (HCFC) on Monday.
In the framework of Regulation 2037/2000 EC on substances that deplete the ozone layer, and in compliance with commitments made under the Montreal Protocol on these same products and the protection of the ozone layer, the EU has scheduled the gradual abandonment of the production and use of chlorofluorocarbons, other fully halogenated chlorofluorocarbons, halons, carbon tetrachloride, 1,1,1-trichloroethane, hydrobromofluorocarbons and bromochloromethane.
Another major problem is the toxic nature of many of the substances, including arsenic, bromine, cadmium, Halogenated flame retardant, hydro Chlorofluorocarbons (HCFCs), lead, mercury and PCBs.
China and Venezuela have pledged to phase out the use and production of chlorofluorocarbons (CFCs) by the end of 2007, two years earlier than required by the Montreal Protocol on Substances that Deplete the Ozone Layer.
That's thanks to a law in 1987 banning chlorofluorocarbons (CFCs), or ozone-chewing chemicals, from aerosol cans and refrigerators.
But wait," you say, "I thought we took care of the environmental problems of air conditioning refrigerants a long time ago when we replaced ozone-depleting chlorofluorocarbons (CHC-12) with hydrofluorocarbons (HFC-134a).
When it became known that chlorofluorocarbons and hydrochlorofluorocarbons in refrigerants were contributing to depletion of the earth's protective ozone layer, NIST began a program (funded by the Department of Energy's Office of Basic Energy Sciences and Office of Building Technologies) to measure the properties of their replacements.