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Polychlorinated Biphenal (PCBs)
PCBs belong to a broad family of man-made organic chemicals known as chlorinated hydrocarbons. PCBs were domestically manufactured from 1929 until their manufacture was banned in 1979. They have a range of toxicity and vary in consistency from thin, light-colored liquids to yellow or black waxy solids. Due to their non-flammability, chemical stability, high boiling point, and electrical insulating properties, PCBs were used in hundreds of industrial and commercial applications including electrical, heat transfer, and hydraulic equipment; as plasticizers in paints, plastics, and rubber products; in pigments, dyes, and carbonless copy paper; and many other industrial applications. Although no longer commercially produced in the United States, PCBs may be present in products and materials produced before the 1979 PCB ban. Products that may contain PCBs include:
  • Transformers and capacitors
  • Other electrical equipment including voltage regulators, switches, reclosers, bushings, and electromagnets
  • Oil used in motors and hydraulic systems
  • Old electrical devices or appliances containing PCB capacitors
  • Fluorescent light ballasts
  • Cable insulation
  • Thermal insulation material including fiberglass, felt, foam, and cork
  • Adhesives and tapes
  • Oil-based paint
  • Caulking
  • Plastics
  • Carbonless copy paper
  • Floor finish
PCBs have been demonstrated to cause a variety of adverse health effects. PCBs have been shown to cause cancer in animals. PCBs have also been shown to cause a number of serious non-cancer health effects in animals, including effects on the immune system, reproductive system, nervous system, endocrine system and other health effects. Studies in humans provide supportive evidence for potential carcinogenic and non-carcinogenic effects of PCBs. The different health effects of PCBs may be interrelated, as alterations in one system may have significant implications for the other systems of the body. The potential health effects of PCB exposure are discussed in greater detail below.
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