Several of the raw materials used to produce plastics, at room temperature, are very non-reactive and some are extremely reactive. For example, polyethylene is manufactured using one reactive compound, ethylene. Waxes, such as paraffin wax used for candles and food additives, may also be made with it. Although not especially poisonous, gaseous ethylene is an asphyxiating, chemically active and highly inflammable material.Those characteristics are altered when converted to a plastic. The plastics manufactured from recycled raw materials do not have the same properties as the raw materials themselves. EPA concluded that "there is an extremely low likelihood that future exposure to water-insoluble polymers of high molecular weight, as a class, would result in unacceptable danger or damage to human health or the environment".