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The industry association for North Americas producers of PET polyethylene terephthalate the clear and lightweight plastic used around the world to package foods beverages personal care products and other consumer items. PETRA the PET Resin Association is dedicated to PET is the most recycled plastic in America. Bottles jars and containers made of PET can be identified by the 1 and chasing arrows code stamped on the bottom. Is PET a singleuse plastic.