PEEK (polyetheretherketone) belongs to the group of polyaryletherketones (PAEK) and is part of the high-temperature-resistant thermoplastics. The outstanding properties of PEEK include not only temperature resistance, but also high mechanical strength, very good chemical resistance and wear resistance. Components of the semi-crystalline material have a permanent place in the automotive and aviation industries and not just because of their low smoke emission and toxicity, but because of their outstanding processing. PEEK is also represented in electronics and space travel due to its high-performance properties. The medical industry and the general replacement of metals by thermoplastics sums up the wide range of applications.