| polychlorinated biphenyls |
are a group of synthetic organic chemicals that can cause a number of harmful effects. PCBs were used widely as coolants and lubricants for transformers, capacitors, and other electrical equipment. Some PCBs are volatile and may exist as a vapor in the air. PCBs enter the environment as mixtures containing a variety of individual chlorinated biphenyl components.
출처: www.afrpa.hq.af.mil/kelly/Williams/glossary.htm
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| polychlorinated biphenyl |
A group of commercially produced organic chemicals used since the 1940s in industrial applications throughout the nuclear weapons complex. PCBs are found in many of the gaskets and large electrical transformers and capacitors in the gaseous diffusion plants. They can be toxic to humans and animals.
출처: legacystory.apps.em.doe.gov/text/link/link12.htm
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| polycarbonate |
(extended definition) Engineering thermoplastic resin. Polycarbonate is a transparent material with an incredibly high resistance to impact. For this reason it is a major component in bullet-proof "glass" and commonly used for beer jugs and conservatories. Its ability to handle high temperatures sees it used in microwave cookware. Subject to attack from solvents. It is commonly injection molded, extruded, and blow molded. (Working Temperature Range: -25
출처: www.specialchem4polymers.com/resources/glossary/in...
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| polychlorinated biphenyls |
PCBs form a group of compounds which were developed in the 1930s and were mainly used in the electricity supply industry and mining. Due to their accumulation in the food chain, production of PCBs was halted world-wide at the beginning of the 1980s and in 1996 an EC Directive was agreed requiring a phase-out of continuing uses (mainly in ageing electrical equipment). PCBs are, however, still found in trace concentrations in the sea and in the fatty tissue of marine animals.
출처: www.eurochlor.org/tools/glossary/glossary.htm
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| polychlorinated biphenyls |
A class of chlorinated aromatic compounds composed of two fused benzene rings and two or more chlorine atoms; used in heat exchange, insulating fluids and other applications. There are 209 different PCBs. 2) A group of manufactured chemicals including 209 different, but closely related, compounds of carbon, hydrogen, and chlorine. If released to the environment, they persist for long periods of time and can biomagnify in the food web. ...
출처: response.restoration.noaa.gov/cpr/watershed/calcas...
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