Processing > Identifying Plastic Waste
In 1988, to assist recycling of disposable items, the Plastic Bottle Institute of the U.S. Society of the Plastics Industry devised a scheme to mark plastic bottles by plastic type.
Under this scheme, a plastic container is marked with a triangle of three "chasing arrows", which encloses a number denoting the plastic type:
- Polyethylene terephthalate (PET or PETE)
- High-density polyethylene (HDPE)
- Polyvinyl chloride (PVC)
- Low-density polyethylene (LDPE)
- Polypropylene (PP)
- Polystyrene (PS)
Identification of plastic items that bear this mark is fairly trivial, however not all items will cary this mark.