PEEK (polyetheretherketone) is a special engineering plastic with excellent performance. Compared with other special engineering plastics, PEEK has many excellent characteristics, its temperature resistance reaches 260 ° C and its mechanical properties are stable, self-lubricating, chemical corrosion resistance, flame retardant, peeling resistance, abrasion resistance, radiation resistance and high mechanical properties. But not resistant to strong nitric acid, concentrated sulfuric acid.