Inženirska plastika se nanaša predvsem na termoplastiko, ki jo je mogoče uporabiti kot strukturne materiale. Engineering plastics have excellent comprehensive properties, high rigidity, low creep, high mechanical strength, good heat resistance, and good electrical insulation. They can be used for a long time in harsh chemical and physical environments and can replace metals as engineering structural materials. Engineering plastics can be divided into general engineering plastics and special engineering plastics. The main varieties of the former are polyamide (PA), polycarbonate (PC), polyoxymethylene (POM), polyphenylene ether (PPO) and polyester (PBT). And PET) five general engineering plastics; the latter usually refers to engineering plastics with heat resistance above 150Co, the main varieties are polyphenylene sulfide (PPS), liquid crystal High molecular polymer (LCP), polysulfone (PSF), polyimide (PI), polyaryletherketone (PEEK), polyarylate (PAR), etc.
There is no clear dividing line between engineering plastics and general-purpose plastics. For example, acrylonitrile-butadiene-styrene copolymer (ABS) lies between the two. Its advanced grades can be used as engineering structural materials. The grade is ordinary general-purpose plastics (abroad generally speaking, ABS is classified as general-purpose plastics). For another example, polypropylene (PP) is a typical general-purpose plastic, but after glass fiber reinforcement and other blending, its mechanical strength and heat resistance have been greatly improved, and it can also be used as a structural material in many engineering fields . For another example, polyethylene is also a typical general-purpose plastic, but ultra-high molecular weight polyethylene with a molecular weight of more than 1 million, due to its excellent mechanical properties and high heat distortion temperature, can be widely used as engineering plastics in machinery, transportation, Chemical equipment etc.