How do they make bullet-proof glass?

Posted by Knonie

It is made by layering and laminating a polycarbonate material between pieces of ordinary glass. This process creates a glass-like material that’s thicker than normal glass. The polycarbonate is a tough transparent plastic.

Bullet-resistant glass can be between 0.25″ to 3″ thick. A bullet fired at a sheet of bullet-resistant glass will pierce the outside layer of the glass, but the layered material is able to absorb the bullet’s energy and stop it before it exits the final layer. The stopping power is determined by the thickness of the glass. A rifle bullet will hit the glass with a lot more force than a bullet from a handgun.

There’s also one-way bullet-resistant glass that has one side able to stop bullets, while the other side allows bullets to pass through it unaffected. This gives a person being shot at the ability to shoot back. This type of bullet-resistant glass is made by laminating a brittle sheet of material with a flexible material. A bullet fired from outside would hit the brittle material which would shatter around the point of impact and absorb some of the energy over a large area. The flexible material would then absorb the remaining energy of the bullet, stopping it. A bullet fired from inside the same car would easily pass through the glass because the bullet’s force is concentrated on a small area, that causes the material to flex. This causes the brittle material to break outwards, allowing the bullet to pierce the flexible material.

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