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Two halogens – chlorine and fluorine, are found in many compounds that are used for insulating and jacketing electrical wire and cable. Common materials like PVC contains significant amounts of these halogens. PVC for example, contains 29% chlorine by weight. Halogenated compounds are normally very stable. When they burn, however, the halogens separate and become highly reactive forming verytoxic, extremely dangerous, highly corrosive gases that can significantly damage organic, inorganic and metallic materials. The hydrogen chloride gas produced from burning PVC for example, is very similar to “mustard”gas. These halogenated gases are dangerous because when they come in contact with water – even minute amounts,they immediately form acids. The chlorine from PVC makes hydrochloric acid,and the fluorine from Teflon makes hydrofluoric acid. 

These acids are among the strongest and most corrosive that exist.The water source that the gases use to form these acids can be found almost anywhere e.g. moisture in the eyes, throat and lungs of individuals with whom it comes in contact,as well as fire sprinkler systems and humidity in the air.  Fires involving the combustion of halogenated materials can be devastating.