PREOX fibers are produced on the basis of polyacrylonitrile and form an intermediate stage in the production of carbon fibers. Oxidative treatment at 200-300°C produces very temperature-stable, non-melting/dripping and, above all, non-combustible fibers. The fibers are therefore ideally suited for fire protection applications.
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To produce PREOX fibres, acrylonitrile is polymerized in a first step and then spun into PAN fibres. The properties of the resulting PREOX fibers can be significantly influenced by the right choice of co-monomers, spinning technique and degree of stretching. In the next step, the PAN fibers are oxidatively treated at 200-300°C to produce finished PREOX fibers. This treatment step, also known as stabilization in carbon fibre production, comprises two sub-steps. A cyclization reaction of adjacent acyl nitrile units forms a ladder polymer structure, which is further stabilized by dehydrogenation in the subsequent reaction process. Depending on the area of application, the fibers also receive a suitable surface treatment after production.
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State-of-the-art laboratory facilities, quality management according to ISO 9001:2015, energy management according to ISO 50001:2018 and last but not least the high demands on our own work ensure the high quality standards of our Oxidized Polyacrylonitrile fiber. See for yourself.
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