One of the main ingredients in plastic is ethylene which is a byproduct of fossil-fuels. This is made into a polymer and created into different densities of polyethylene at least for plastic bags. Different types of polyethylene resins are also used to create plastic bottles. The resin most often used for water and soft drinks is polyethylene terephthalate.
Among the many other things are organic-tin compounds to help keep the plastic from becoming brittle, antimony as flame retardant, and titanium dioxide pigments.
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