At the base of each bottle, container or plastic container there is a triangle formed by three arrows that is nothing more than a simplification of the international recycling symbol ( Möbius triangle ). Inside the triangle there is a number between 1 and 7, which follows the classification of the American identification system SPI (acronym for Society of Plastics Industry) and, under it, some letters that allow us to recognize at a glance which plastic every bottle is made.
For example, the number 1 corresponds to PETE (polyethylene terephthalate), 3 to the well-known PVC (Polyvinyl Chloride) and 5 to PP (Polypropylene). The 6 is the number assigned to the PS or polystyrene. The lower the number, the easier it is to recycle. These codes facilitate the separation of different plastics according to their chemical composition for recycling processes.
