and countries around the world are developing out of step

Polyethylene terephthalate (PET), with the chemical formula (C10H8O4)n, is the most important variety of thermoplastic polyester, commonly known as polyester resin. PET has good creep resistance, fatigue resistance, friction resistance and dimensional stability, low wear and high hardness. It has the greatest toughness among thermoplastics, so it can be used to produce film sheets and…