Pet:

Chinese name is 聚对苯二甲酸乙二醇酯,

English Name: polyethylene terephthalate, we call pet for short, sometimes also called PET film. It is a milky white or light yellow, highly crystalline polymer with smooth and glossy surface. It has excellent physical and mechanical properties in a wide temperature range, with long-term use temperature up to 120 ℃, excellent electrical insulation. Even at high temperature and high frequency, its electrical performance is still good, but its corona resistance is poor. Creep resistance, fatigue resistance, friction resistance and dimensional stability are good.

Thin film: 

A thin, soft and transparent sheet. Made of plastic, adhesive, rubber or other materials. It is scientifically interpreted as a 2D material formed on the surface of a substrate by deposition of atoms, molecules or ions. For example: frosted film, anti scratch film, release film, polyester film, optical film, plastic film and so on. Widely used in electronics, machinery, printing and other industries.