PCBs or in other words, polychlorinated biphenyls are widely used as organic compounds and as dielectric fluids in transformers and capacitors. PCBs are organic compounds that contain 1-10 chlorine atoms attaché to biphenyl group (C12H10-xClx) and they are formed by electrophilic chlorination of biphenyl with chlorine gas. PCBs or Polychlorinated biphenyls were first commercially used in 1929 as a “safer” cooling and as an insulating fluid in electrical industry.
These PCBs are not only used as coolants and insulating fluid but they are also used as components in early light fittings and in electrical transformers. Besides all these usages, PCBs are also used as plasticizers in paint and cement, as stabilizing additives in flexible PVC coating, in electrical wiring and in electronic components. Since PCBs have high viscosity, high flashing point and high thermal conductivity they can be used for cutting oils, as reactive flame retardants, lubricant oils, hydraulic fluids and sealants. And PCBs are organic compounds that contain Chlorine in it and therefore can also be used as pesticide.