What is PET made from?

PET is a polyester polymer made by reacting ethylene glycol and terephthalic acid.  Pellets of the PET polymer (or resin) are heated to a molten mass, which can easily be moulded into almost any shape. PET was invented by DuPont chemists in the mid-1940s, during a search for polymers that could be used to make new textile fibres. The first PET bottle was patented by Nathaniel Wyeth in 1973 and the first PET bottle was recycled in 1977.