Per- and polyfluorinated chemicals (PFC) are a group of synthetic hydrophobic (water-repelling) and oleophobic (oil-repelling) chemicals that have been used in many consumer products including the membrane and DWR treatments on some technical outerwear.
Perfluorooctanoic acid (PFOA) is a type of PFC that has a very strong (C8) molecular structure that’s very resistant to breaking down. We have never used PFOA and they have not been used in most outdoor apparel for the last ten years.
Per- and polyfluoroalkyl substances (PFAS) is the latest terminology to describe this group of chemicals that include PFCs and PFOA. They are chemicals with a fully fluorinated carbon molecular structure (C4, C6, C8) that resists heat, oil, stains, grease, and water.