What are halogens?
Elements such as fluorine, chlorine, bromine, iodine, and astatine are halogens and are in the seventh main group in the periodic table of the elements. They are found in many chemical compounds, chlorine for example in polyvinyl chloride. PVC, as it is abbreviated, is very durable, which is why it is used in many technical products, including as an insulation and sheathing materials in cables. Chlorine and other halogens are often added as additives to improve flame retardancy. However, this comes at a price. Halogens are harmful to health. For this reason, plastics that do not contain halogens are increasingly being used for cables.