Styrene is used in the production of polystyrene plastics and resins, and in the synthesis of materials for ion exchange resins, and copolymer production. Styrene was originally extracted from the tree storax in 19th century. Its use in rubber production started at the beginning of the 20th century after in E.P. Heinmenn et al succeed in accelerating the polymerization of styrene to rubber in 1910. It is an oily colorless to yellow liquid found in many consumer products (plastic packaging, food containers, and household goods). Short-term exposure to styrene results in respiratory effects, eye irritation, and gastrointestinal effects. Long-term exposure has effects on the central nervous system. Exposure to styrene occurs due to emissions from building materials, consumer products, tobacco smoke, vehicle exhaust or occupational exposure during its industrial processing. Styrene is reasonably anticipated to be a human carcinogen.