| Its primary use is in packaging (plastic bags, plastic films, geomembranes, containers including bottles, etc.). Many kinds of polyethylene are known, with most having the chemical formula (C2H4)n. PE is usually a mixture of similar polymers of ethylene with various values of n. Polyethylene is a thermoplastic; however, it can become a thermoset plastic when modified (such as cross-linked polyethylene).Polyethylene | | Ethylene oxide is a flammable gas that is primarily used to make other chemicals such as ethylene glycol. It is emitted from fossil fuels such as petroleum, natural gas, and coal, and from tobacco products.Ethylene oxide is used to make antifreeze, adhesives, detergents, polyester, fumigants and pesticides, and sterilization agents for medical equipment.Ethylene Oxide | | Propionaldehyde | | in the presence of a palladium catalyst. | | Synthetic Ethanol |