WEBVTT - How does bulletproof glass work?

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<v Speaker 1>brand with today's question, how does bulletproof glass work? At

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<v Speaker 1>first glance, bullet resistant glass looks identical to an ordinary

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<v Speaker 1>pane of glass, but that's where the similarities end. An

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<v Speaker 1>ordinary piece of glass shatters one struck by a single bullet.

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<v Speaker 1>Bullet resistant glass is designed to withstand one or several

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<v Speaker 1>rounds of bullets, depending on the thickness of the glass

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<v Speaker 1>and the weapon being fired at it. So what gives

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<v Speaker 1>bullet resistant glass the ability to stop bullets? Different manufacturers

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<v Speaker 1>make different variations of bullet resistant glass, but it's basically

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<v Speaker 1>made by layering a polycarbonate material between pieces of ordinary

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<v Speaker 1>glass in a process called lamination. This process creates a

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<v Speaker 1>glass like material that's thicker than normal glass. Polycarbonate is

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<v Speaker 1>a tough, transparent plastic often known by the brand names Lexan,

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<v Speaker 1>tough Act or Syrolin. Bullet resistant glass is between seven

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<v Speaker 1>millimeters and seventy five millimeters in thickness. A bullet fired

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<v Speaker 1>at a sheet of bullet resistant glass will pierce the

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<v Speaker 1>outside layer of the glass, but the layered polycarbonate glass

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<v Speaker 1>material is able to absorb the bullets energy and stop

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<v Speaker 1>it before it exits the final layer. The ability of

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<v Speaker 1>bullet resistant glass to stop a bullet is determined by

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<v Speaker 1>the thickness of the glass. A rifle bullet will collide

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<v Speaker 1>with the glass with a lot more force than a

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<v Speaker 1>bullet from a handgun, so a thick or piece of

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<v Speaker 1>bullet resistant glass would be needed to stop a rifle

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<v Speaker 1>bullet as opposed to a handgun bullet. There's also one

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<v Speaker 1>way bullet resistant glass available, which has one side able

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<v Speaker 1>to stop bullets while the other side allows bullets to

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<v Speaker 1>pass through it unaffected. This gives a person being shot

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<v Speaker 1>at the ability to shoot back. This type of bullet

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<v Speaker 1>resistant glass is made by laminating a brittle sheet of

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<v Speaker 1>material with a flexible material. Imagine a car equipped with

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<v Speaker 1>this one way bullet resistant glass. If a person outside

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<v Speaker 1>the car shoots a bullet into the window, the bullet

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<v Speaker 1>would strike the brittle side first. This brittle material would

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<v Speaker 1>shatter around the point of impact and absorb some of

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<v Speaker 1>the energy over a large area. The flexible material then

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<v Speaker 1>absorbs the remaining energy of the bullets, stopping that bullet.

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<v Speaker 1>A bullet fired from the inside of the same car

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<v Speaker 1>would easily pass through the glass because the bullets forces

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<v Speaker 1>concentrated on a small area, which causes the material to

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<v Speaker 1>fly x. This causes the brittle material to break outward,

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<v Speaker 1>allowing the bullet to pierce the flexible material and strike

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<v Speaker 1>its target. For more on this and thousands of other topics.

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