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Polyvinylchloride (PVC)
Before flames are present, heated PVC can generate toxic and deadly fumes. In the early stages of a fire, heat causes the PVC molecules to begin to come apart generating hydrochloric acid (HCl), carbon monoxide, Deadly Phosgene Gas, benzene, toluene, xylenes, chlorinated biphenyls, PCDDs and PCDFs. The release of HCl on thermal degradation of PVC has been well documented in the scientific and medical literature. PVC, of all the synthetic plastic polymers, has been implicated as causing one of the most insidious, serious problems in fire fighting due to its release of HCl while burning. Once the decomposition temperature has been reached (above 225 degrees Celsius), hydrogen chloride is generated from the thermal decomposition of PVC. By the time actual combustion begins (around 475 degrees Celsius), PVC has lost over 60% of its weight in the generation of HCl and other chemicals. The toxic gases generated during this pre-combustion period are particularly dangerous as there is no flame to warn fire fighters and occupants.
Ken
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