Engineering Plastics mainly include five kinds of Engineering Plastics (polyoxymethylene : POM, polyethylene terephthalate : PET, polycarbonate : PC, polyamide : PA, and modified-Polyphenyleneether : m-PPE) . Engineering Plastics generally have heat resistance values of not less than 100 ℃, tensile strength of not less than 49 MPa and flexural modulus of not less than 2.4 GPa. Engineering Plastics having over 150 ℃ of heat resistance values are called Super Engineering Plastics. Super Engineering Plastic has excellent heat resistance because it has benzene linkages with pendant groups in polymer chains. Polyetherimide, Polyacrylate and Polysulphone are used in medical application because of their transparency. PPS can be used as metal replacement to reduce overall cost. Polyimide extrusions can retain their properties at high and low temperatures. Therefore, they are used in the aerospace industry.