Engineering plastic

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Engineering plastics are plastics that regain their original shape after deformation. If an engineering plastic reaches a critical amount of deformation, it may be unable to regain its original shape. Engineering plastics are plastic materials that exhibit superior mechanical and thermal properties in a wide range of conditions. This term usually refer to thermoplastic materials rather than thermoset ones.

They are generally distinguished from other plastics by their improved properties which generally come at a higher cost.

Examples of engineering plastics include: polycarbonates, polysulfides, polyimides, and polybutylene terephthalate.