PET is a kind of polyester produced from the polymerization of terephthalic acid and ethylene glycol. Compared with polyolefin, it provides higher heat resistance, transparency and strength, and can be used for various purposes. A PET bottle for beverage is a typical package.
As PET is a thermoplastic, within a certain temperature band the polymer becomes extremely pliable, making it easy to mould in to shapes. This occurs between the glass transition temperature and the melting point, which for PET are 75oC and 255oC respectively. Once cooled, PET will return to a solid form, making the plastic polymer extremely useful for drinks bottles. It is also almost completely impermeable.
Other typical uses of polyethylene terephthalate include:
• Food packaging (microwavable meals)
• Thin film
• Solar cells
• Thermal insulation
• Adhesive tape
• Magnetic tape
• Polyester and associated textile products