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However, the general chemical formula for a polymer plastic can be written as (CH2-CHX)n, where X can be any number of different atoms, depending on the type of plastic. For example, the chemical formula for polyethylene is (CH2-CH2)n, where n is the number of repeating units in the polymer chain.
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Plastic chemical formula from www2.chemistry.msu.edu
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Commodity plastics ; Polyvinyl chloride (PVC). 38. 9.3 ; Polyethylene terephthalate (PET). 33. 8.1 ; Polyurethane (PUR). 27. 6.6 ; PP&A Fibers · 59. 14.5.