How to identify plastic There are many forms and types of plastic, each with their own set of features and benefits. It’s part of the reason why plastic is so versatile and useful. So here’s a key of commonly used symbols that will help you to identify which plastic is which. Lidding film, grocery bags, bubble wrap, wire & cable, flexible lids, agricultural films LDPE Low-density polyethylene 4 Milk bottles, beverage bottle lids, cleaning products, toys, buckets, pipes, flower pots HDPE High-density polyethylene 2 Food packaging, cling film, pharmaceutical blister packs, flooring, furniture, window frames, credit cards PVC Polyvinyl chloride 3 PET Polyethylene terephthalate Food trays, soft drinks bottles, carpet fibre, clothing, mouthwash bottles 1 14 Klöckner Pentaplast