Alternatively, these PFAS materials, perhaps are truly benign to the environment and human health, sort of like the poly-tetrafluoroethylene compound, known and in worldwide use for around 80 years now under the tradename Teflon
The element fluorine (with the chemical notation ‚"F") is in the crosshairs of many do-gooders these days. That isn't new but appears to have recently gained momentum. For example, the Society of Environmental Toxicology and Chemistry (SETAC), has recently called for a scientific meeting on the ‚"Environmental Risk Assessment of PFAS," to take place at Durham, NC, on Aug. 12-15, 2019.
The EPA's current PFAS Research list (as of July 2019) comprises 165 of such chemicals. Of course, that's only a small fraction of natural and synthetic organic chemicals, i.e. substances that contain carbon-to-fluorine bonds. My own list, based on TerraToxTM databases covers more than 8,000 of such compounds.