The applications of halogen-free cables are provided in the Low Voltage Electrotechnical Regulations (REBT), which are called “wire HS” or “High Security”.
They are safe wires because their insulation do not contain any chemical element of group 17 of the periodic table, that is to say, neither fluorine nor chlorine nor bromine nor iodine and nor astatine. All of them are elements so reactive that they are never found in nature without mixing with others. The result of the combustion of materials of this type is a large amount of corrosive, toxic and opaque smoke. Therefore, the halogen-free cables, in case of fire, are much better behaved than, for example, PVC (it contains chlorine).