“Before recycling, plastics are sorted according to their resin identification code, a method of categorization of polymer types, which was developed by the Society of the Plastics Industry in 1988. Polyethylene terephthalate, commonly referred to as PET, for instance, has a resin code of 1.”
he Society of the Plastics Industry determines which plastics are recyclable via their resin identification code, which is a code put on all recyclable plastics.
The numbers found on plastics, the one surrounded by a triangle of arrows, is the resin identification code. It was developed by SPI, the Society of the Plastics Industry. It does not identify the types of plastics that are recyclable but rather identifies what plastic an item is made of to make it easier to sort it for recycling. Many recycling centers only recycle those labeled #1 or #2. Those identified as resin code #7 are new plastics that do not belong in the other 6 categories and are not all made of the same material.
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