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Perfluorinated compounds (PFCs) are a family of fluorine-containing chemicals with unique properties to make materials stain- and stick-resistant. Some PFCs are incredibly resistant to breakdown and are turning up in unexpected places around the world. PFOA or perfluorooctanoic acid, used to make Teflon™ products. PFOS or perfluorooctane sulfonate, a breakdown product of chemicals formerly used to make Scotchgard® products.