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Bob Gore often describes the invention of Gore-Tex (R), as a "Discovery" rather then an invention. He was attempting to expand a rod of PTFE (Teflon), by heating the entire rod in a small oven, then grasping both ends of the Rod with asbestos gloves and slowly pulling both ends. He was hoping to achieve an expansion (elongation), of about 10%. After failing to stretch this material slowly a number of times, he gave a very healthy "Yank" to his last sample and to his amazement, it stretched, not just 10% but amazingly higher percentage. Hence the discovery/invention of Gore-Tex.
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