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Polyaryletherketones are aromatic partly crystalline materials with exceptional properties. They have aromatic groups linearly connected through ether and ketone groups. The most common type is PEEK, polyetheretherketone, commercially available since 1978. The aromatic and ketone structure give high thermal strength, and the ether groups provide flexibility. The melting point of PEEK is 334 C and the glass transition is 143 C.