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What is Kevlar? And how does it stop bullets?

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What is Kevlar? And how does it stop bullets?

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Kevlar is a synthetic material developed by DuPont. It is about 10 times the tensile strength of steel, by weight. When a bullet impacts the vest, it deforms as it tries to penetrate each successive layer, the deformation helps to distribute the impact over an ever-larger area. The photos on this site show a 9mm JSP that only makes it thru 2 or 3 layers out of 18. Click here to view test sample results.

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