Polyethylene Terephthalate (PET) is a durable, lightweight thermoplastic polymer widely known for its use in packaging, particularly for beverages and food products. It is a type of polyester that offers excellent mechanical strength, clarity, and resistance to chemicals and moisture. PET is fully recyclable, making it a popular choice in industries focused on sustainability. Its combination of transparency, toughness, and barrier properties makes it ideal for applications ranging from plastic bottles to synthetic fibers.

PET is formed through the polymerization of ethylene glycol and terephthalic acid. It is highly versatile, offering both rigidity for containers and flexibility for fibers. The material is renowned for its glass-like transparency, which, combined with its strength, has made it one of the most used plastics worldwide.