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This specification covers polyetheretherketone (PEEK) polymer in virgin forms as pellets, powder, and so forth. It provides requirements and associated test methods for these thermoplastics when they are to be used in the manufacture of intracorporeal devices such as surgical implants or components of surgical or dental devices. The PEEK polymer in the scope of this specification is a pure semicrystalline homopolymer consisting of phenylene rings connected by ether (E) and carbonyl (or ketone, K) groups along the polymer chain. Its polymeric structure is defined by the repeating unit EEK. As with any material, some characteristics may be altered by the processing techniques (molding, extrusion, machining, assembly, sterilization, and so forth) required for the production of a specific part or device. Therefore, properties of fabricated forms of these polymers shall be evaluated using appropriate test methods such as US Pharmacopeia test (infrared spectroscopy, viscosity measurements, and total heavy metal content (as lead)), and differential scanning calorimetry. Fabricated forms, material or forms containing colorants, fillers, processing aids, or other additives, as well as polymer blends which contain PEEK, or reclaimed materials, are not covered by this specification. The properties which shall be evaluated are the following: density, tensile strength, elongation, flexural strength, flexural modulus, and impact strength. The biocompatibility of PEEK polymers is also detailed.