| | An Introduction To Plastics (Site not responding. Last check: 2007-10-22) |
 | | By the early 19th century natural rubber, based on a polymer now known as "isoprene" and tapped from rubber trees, was in widespread use. |
 | | The US government launched a major effort to ramp up synthetic rubber production, and by 1944 a total of 50 factories were manufacturing it, pouring out a volume of the material twice that of the world's natural rubber production before the beginning of the war. |
 | | Although acrylics are now well-known for the use in paints and synthetic fibers, such as "fake furs", in their bulk form they are actually very hard and more transparent than glass, and are sold as glass replacements under trade names such as "plexiglas" and "lucite". |
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