PET is made up of repeating (C10H8O4) models. PET is often recycled, and it has the digit one (?) as its resin identification code (RIC). The National Affiliation for PET Container pet methods (NAPCOR) defines PET as: "Polyethylene terephthalate items referenced are derived from terephthalic acid (or dimethyl terephthalate) and mono ethylene glycol