PET (polyethylene terephthalate) Definition: Polyethylene terephthalate, commonly known as PET, is a type of thermoplastic polymer resins. When PET is used in fabrics, it is also called polyester, which is just like a garment fabric. PET is light, cheap, non-reactive and shatterproof, making it a popular packaging material. Despite the name it does not contain polyethylene. Polyethylene terephthalate (PET) is made up of polymerized units of ethylene terephthalate, with repeating units of C10H8O4PET that can exist both as invisible and also in semi-colors. Uses: PET used in many different things such as food containers. Beverage containers Drinking bottles drinking waterIt is also used to cover baked goods. It is used to hold cosmetic products because it is easy to mold into the desired shape. It is also used to store chemicals such as household cleaners, paints. etc.It is used for thermal insulation such as space blankets.It is used as a substrate in thin films and solar cells.In synthetic fibersPlastic bottlesJuice bottlesPage no. 2Physical Properties:It is colorless in its natural state. It forms a good barrier to moisture and solvents and produces a good gas. It has impact resistance and very strong. It turned white when exposed to other chemicals such as chloroform and toluene. PET's most important property is its inherent viscosity, which means it absorbs water from its surroundings and creates... half the paper... polyester is as diverse as assembly methodologies focused on essential pellets or fusion. Depending on the reused materials, polyester could be used today in most polyester assembly techniques as a blend with virgin polymer or progressively as a 100% reused polymer. Some exemptions such as low thickness BOPET film, exceptional arrangements such as optical films or yarns via FDY spinning at >6000 m/min, microfilaments and microthreads are processed only from virgin polyester. Conclusion: From all the above information and research we conclude that PET is a very useful plastic among all because it is very effective and safe, that's why it is used to cover food and drinks. PET is a long-lasting plastic. Most PET plastic is used in bottles, juice bottles and food storage containers.