Plastic recycling labels are everywhere: The ubiquitous "chasing arrows" symbol adorns everything from plastic bags and water bottles to kids' toys.
Most commonly, these symbols appear with a number — 1 through 7 — that identifies the type of plastic resin a product is made of. A number 1, for instance, corresponds to polyethylene terephthalate, or PET — the stuff that makes up water bottles. Number 6 is for polystyrene, used in foam cups and trays. The plastics industry insists these icons were never meant to indicate a product's recyclability, even though that is how they are often perceived by consumers.
