Perfluoroalkyl and polyfluoroalkyl substances (PFAS) are part of a broad chemical group that were first developed in the 1940s. Since then, there have been nearly 5,000 different PFAS compounds that have found their way into commercial use. Some of these compounds are now being phased out due to toxicity concerns, however new fluorinated compounds like Gen X and ADONA are being developed to replace them.
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