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PET is the abbreviation for polyethylene terephthalate, a plastic resin and a form of polyester. Polyethylene terephthalate is a polymer originating from the combination of two monomers called monoethylene glycol (MEG) and terephthalic acid (PTA). At the foundation of this substance are two raw materials derived from petroleum: ethylene and paraxylene.

As a polymer, PET molecules consist of long chains of repetitive units that contain only carbon (C), oxygen (O) and hydrogen (H).

The unitary structure within the rectangle is a repeated unit. The higher the molecular weight (n), the better the properties. Normally, n is understood to be the interval between 100 and 200.

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