PET sheet is made of polyethylene terephthalate resin through extrusion or calendering process. It is a new plastic product developed in recent years. PET sheet is a thermoplastic environmentally friendly plastic product. It has excellent physical and mechanical properties over a wide temperature range. It has excellent electrical insulation properties. Even at high temperatures and high frequencies, its electrical insulation properties are still good, and its creep resistance, fatigue resistance, friction resistance and dimensional stability are all very good.