PET means Polyethylene Terephthalate. That is the type of plastic it is, which is determined by the chemicals used to create it. If you look at your plastic containers they will have what number and type they are.
It's a plastic resin and the most common type of polyester. Two monomers—modified ethylene glycol and purified terephthalic acid—are combined to form the polymer called polyethylene terephthalate. PET was discovered and patented in England in 1941.
Many beverages, food items and other consumer products are delivered in bottles or packages made from PET. The #1 code is usually found on or near the bottom of the container.
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