PEEK replaces metal, stainless steel and titanium in engine enclosures, gaskets, bearings, clutch gears, seals and other components, and can be used in transmission, braking and air conditioning systems. In addition, PEEK has been successfully used in the automotive industry as an alternative to metals (including stainless steel and titanium) for engine covers, automotive bearings, seals and brake pads due to its good friction resistance.