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eing an aramid fiber that on a weight-by-weight basis proves to be 5 times stronger than steel, makes for a possible answer. All though there are new aramid fibers that are stronger in certain criteria, Kevlar was chosen because of its vast popularity and product knowledge if the sneaker soles were to be marketed. Many snowboarding gloves are covered with Kevlar. This application relates to skateboarders since many of them snowboard in the winters and have product knowledge of the fiber. Other fibers that are also applicable for this situation are Akzo's Arenka (aramid), Celanese's Vectra (thermotropic copolyesters), Dart's Xydar (thermotropic copolyesters), and Allied-Signal's Spectra 900 (high modulus polyethylene). HEAVY COMPETITION A few years ago competition was so high between these companies that Allied-Signal filed a suit against DuPont in 1991, charging them with false advertising and illegally monopolizing the market. The issue was raised since the National Institute of Justice (NIJ), a branch of the Department of Justice raised their standards for bullet proof vests. The NIJ tested their current supplier's (DuPont) product which was produced from Kevlar and Allied-Signals Spectra Shield which uses Spectra 900, with a nine-millimeter gun on a 30 degree angle, there were astonishing results: Less than 50 percent of the Kevlar vests passed, while 97 percent of the Spectra Shield vests did pass. WHAT EXACTLY IS KEVLAR? In the early 70's DuPont introduced aramids under trade name of Kevlar and Kevlar 49, also fon-nerly known as Fiber B and PDR-49. These fibers and Kevlar 29 do not melt, for all practical purposes, other than at temperatures involving decomposition. They are nearly insoluble. Thus making conventional melt polymerization and melt spinning not feasible. Kevlar is made by the spinning of fibers from liquid crystals in a solution exhibiting a reduced viscosity, with increasing solids content as the solution becomes ani...

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