Chemours is a leading producer of titanium dioxide products and fluoroproducts. The former are commonly used in everyday applications, such as providing the UV-blocking properties of sunscreen, and are relatively easy to manufacture in massive quantities without issues. The latter are commonly used in non-stick products, such as energy-efficient water filters and Teflon, but previously required highly toxic intermediates to manufacture. That includes a compound called perfluorooctanoic acid, or PFOA, which was at the root of the settlement agreement announced Monday.