Halogen refers to halogen group elements, including fluorine, chlorine, bromine, iodine, astatine and other elements. The first four elements exist as organic compounds in plastic polymer materials. Adding halogen to plastic polymer products can increase its ignition point to about 300 ℃. When burning, halogen will emit halogenated gas, quickly absorb oxygen, so that the flame will be extinguished and play a role in flame retardancy. Therefore, halogen has been widely used in plastic materials.
However, with the strengthening of environmental protection and health awareness, people are gradually aware of the hazards and carcinogenic effects of halogen on the immune system, endocrine system, reproductive system, and body development. And because halogen will release strong carcinogens such as dioxin and phenylfuran and corrosive gases such as hydrogen bromide and hydrogen chloride after combustion, it will seriously damage the environment. This directly leads to the fact that halogen plastics can not only not be simply incinerated, but also difficult to be recycled. Therefore, many countries advocate the use of halogen-free environment-friendly plastics. In the connector field, it has become normal to require halogen-free connectors. When the customer wants to confirm whether the connector is halogen-free, he can ask the manufacturer to issue a halogen-free test to ensure that the connector meets the use requirements.
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