What is halogen free? Are halogen-free flame retardants completely halogen-free?

1. What is the concept of halogen-free?

Halogens are listed in Group VIIA of the periodic table and belong to non-metallic elements, including five elements: Fluorine, Chlorine, Bromine, Iodine, and Astatine. Halogen often refers to the four elements of fluorine, chlorine, bromine and iodine, which usually exist in the form of organic compounds in products, especially in polymer materials.

2. The origin of the halogen-free concept.

Halogen Free or Non-Halogen, according to the requirements of regulations IEC 61249-2-21: bromine and chlorine content are less than 900ppm respectively, and the sum of bromine and chlorine content is less than 1500ppm, it is halogen-free. Therefore, halogen-free is not really halogen-free, but the halogen content in the product is below a certain value.

3. Why put forward the concept of halogen-free?

Halogens are often used as flame retardants in electronic components and materials, product casings, plastics, etc. Halogen flame retardants are almost difficult to recycle and release harmful substances during combustion and heating, threatening human health, the environment and future generations. Therefore, corresponding halogen restriction requirements have been formed in various countries.

4. Can it really be halogen-free?

At present, halogen-free cannot be achieved in many application scenarios, because halogen is still one of the most efficient flame retardants and has little effect on the mechanical properties of materials in practical applications. However, with the development of science and technology, the flame retardant industry is also making continuous progress, and halogen-free flame retardants can be completely used in many application scenarios.

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