Alfas (also known as TFE/P) is a copolymer of tetrafluoroethylene (TFE) and propylene. Alfas is unique due to its resistance to petroleum products, steam, phosphate esters and brake fluids. In some respects, it exhibits media compatibility properties similar to ethylene propylene (EPDM) and fluorocarbon (FKM). It has fair resistance to brake fluids and phosphate esters while exhibiting good resistance to petroleum oils.