Polyether ether ketone (PEEK) plastic is a highly coveted engineering material, thanks to its superb blend of strength, resistances, and workability. PEEK plastic is a semicrystalline engineering thermoplastic of the polyaryletherketone (PAEK) family with high-temperature tolerances, strength, and stability across harsh environments. It is manufactured using stiff aromatic units, which contribute to its high melting point of 343 °C/649 °F. PEEK comes in numerous grades of either highly pure PEEK or reinforced with carbon fiber, glass, or other engineering plastics.