Monday, July 27, 2020

How Does it Work? "One-Way Bulletproof Glass"

Bulletproof Glass

Your eyes are not kidding you. There's regular bulletproof glass that can stop bullets on both sides. And there's one that can stop bullets on just one side. So basically, approaching a bulletproof vehicle nowadays whilst shooting it would look cool. However, you might probably just end up in point-blank range.

The common misconception is regular bulletproof glass is just one thick, extremely hard block of glass. This notion would make it difficult to wrap your head around this concept. Regular bulletproof glass is rather made by layering polycarbonate thermoplastic between pieces of ordinary glass. Polycarbonate is a tough transparent plastic commonly known by the brand names: Lexan, Tuffak or Cyrolon. The process, Lamination creates a transparent material thicker than glass. A bullet fired at a bulletproof glass would pierce the outer layer of glass. However, the layered polycarbonate would absorb the bullet's energy, thus halting its motion.

Bulletproof Glass Illustration
One-Way Bulletproof Glass tweaks the concept a little to fit its purpose. It rather has a harder, brittle material like acrylic on the outside laminated with a softer, flexible substance(like a thin sheet of polycarbonate) on the other side.
As such a bullet that first encounters the hard side would expend most of its energy penetrating the hard layer. The flexible layer absorbs the remaining energy, thus dragging the bullet to a stop.

A bullet fired from the other side would have most of its energy focused on a small area. This would cause the flexible layer to flex inwards putting enough stress on the brittle layer to crack. This would enable the bullet to penetrate the brittle layer much easier as well, emerging largely undeterred. So just remember to be on the right side when the bullets start flying.

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