The year 1965 brought the invention of Kevlar, but it wasn’t long before folks started designing bullets that could penetrate the wearable armor in which it was used. In 2016, it looks to be metal foam that measures only a few millimeters in thickness that will be the next line of defense against a bullet.
The foam, Developed by NC State professor of mechanical and aerospace engineering Afsaneh Rabiei, is able to stop an armor-piercing bullet in only a fraction of an inch. In fact, the foam worked so well that the only indentation on the target was only 8mm in depth or about less than a third of an inch.
Rabiei tested the foam against two different rounds to gauge results, the standard NATO 7.62×51mm rounds, and against the rare 7.62 × 63-millimeter bullet.
The foam has tested to meet the Department of Justice’s standards for Type IV armor, which is armor that is considered to be useful against armor-piercing bullets.
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H/T: Popular Science