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Engineering polymers are a group of polymer materials designed for use in harsher conditions and specialized applications. Compared to many general plastics, these materials have higher thermal resistance, mechanical strength, dimensional stability, and chemical resistance. Polycarbonate, polyamide, ABS, POM, and PBT are among the most widely used engineering polymers in various industries. These materials are used in the production of automotive parts, electrical and electronic equipment, industrial appliances, precision parts, and medical products. One of the important advantages of engineering polymers is the possibility of replacing some metal parts with lighter materials, which can reduce product weight and production costs. Also, by using additives, reinforcing fibers, and various modifiers, the properties of these polymers can be changed according to the intended application. Accurate knowledge of the technical specifications of the polymer plays an important role in selecting the right material and increasing the performance of the final product.