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ECHA: Per- and polyfluoroalkyl substances (PFAS)

They all contain carbon-fluorine bonds, which are one of the strongest chemical bonds in organic chemistry. This means that they resist degradation when used and also in the environment. Most PFAS are also easily transported in the environment covering long distances away from the source of their release.

https://echa.europa.eu/hot-topics/perfluoroalkyl-chemicals-pfas
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