Generally speaking engineering plastics are those which are now replacing conventional materials such as metals and alloys in general engineering, or, they are materials which have properties which are not available in conventional materials.
A work range of plastics are now being used in engineering. These include polyolefins and their copolymers, polyacetals , polyphenylene oxide, polyarylates, epoxy resins, polyetheretherketone, polyetherimide, polyetherester amide, polyamides, polyamide-imide, polyimides, polydiallylisophalate, polyallyl phthalate, polyethyleneterephthalate, polybutylene terephthalrte, polycarbonate, polyesters, polyethylene sulphide, polyphenylene sulphide, aromatic disulphides, fluorinated ethylene-propylene, polytetrafluoro ethylene, polyvinyl fluoride, polyvinylidene fluoride, perfluoroalkoxy ethylene, ethylene-tetrafluoroethylene, ethylene chlorotrifluoroethylene and polysiloxanes.
Some mechanical properties of engineering polymers can be considerably improved by the incorporation in their formulation of reinforcing agents such as glass fiber, talc, carbon fiber, carbon nanotubes, organically modified clays and mica.
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