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. The terms engineering plastics usually refers to thermoplastic rather than thermoset materials.

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.

Plastics