We have talked about Amazing Facts About Glass, Things That Are Easily Found Around Us. Now, Can you imagine how come does the material called bulletproof glass can be strong enough to be completely bulletproof? You need to know some facts about bulletproof glass then! Such material is very effective at dissipating a bullet’s energy and this make the material can prevent much harm as it ordinarily would.
Facts about bulletproof glass that you might don’t know yet
- How come does the ordinary glass shatters?
The ordinary glass can be shattered because it cannot bend and absorb the energy gradually as the bullet strikes it, so it become shattered. This allows the bullet to continue with hardly any loss of momentum. On the other hand, Bulletproof glass works by absorbing and dissipating the energy so the bullet is slowed.
As an analogy, you may imagine if you catching a very fast baseball without moving your hand. The force of the ball hitting your hand would hurt your hand very much and even can break your wrist. Try to compare it if you wrist bend backwards flexibly. The ball’s momentum will change gradually rather than suddenly so the force of the impact is reduced. This is one of important facts about bulletproof glass.
- How does the Bulletproof Glass Work?
The bulletproof glass is composed of laminate of glass and plastic rather than composed by laminate of regular glass. The final inner layer is sometimes composed of a tough polycarbonate or plastic film. This can prevent “spalling”, when the bullet impacts by the presence of broken glass or the release of dangerous plastics. Compared to a single pane of ordinary glass, the bulletproof glass is ten times thickee and is usually very heavy.
Like polycarbonate materials, acrylic can also be an alternative which will determine how resistant the glass is to projectiles. The laminated glass layers will be bonded together with chemicals such as polyurethane or PVB (polyvinyl granules) which are often chemically processed in a vacuum processed to remove air pockets that can weaken bonds, strengthen the glass and make the coating more transparent. the unit is then pressurized and heated to strengthen the bond.
The energy of a bullet striking the bulletproof glass spreads out sideways through the layers of bulletproof glass. That’s why the energy is quickly absorbed, slowing the bullet down so the energy is no longer present to pierce through, or do much damage if it does so. Even when the glass panes do break when shot, there still the plastic layers to stop them from flying apart.
Bulletproof glass varies in thickness depending on where it is placed and how much the user can afford. the more layers of glass the thicker it gets and the more energy it can absorb. Basic bulletproof glass is about 3cm (1.185 in) to 4cm (1.59 in) thick, and can be even thicker if needed. This is one of facts about bulletproof glass that you need to know.
- How is the layer too thick?
The flak glass will be very heavy, making it difficult to use, and more opaque, because the light will have a harder time getting through all the extra layers.
One-way bulletproof glass
The one-way bulletproof glass is designed to keep attackers from firing in, while people inside can continue firing. One-way bulletproof glass is made of two layers, namely a layer on the outside which is brittle and a layer on the inside which is more flexible. The bullets fired from the outside would hit the brittle layer first and destroy the area. The kinetic energy of the bullet will be partially absorbed, and spread over a wider area. then it will stop when the bullet hits the flexible layer after slowly slowing down.
However, when the bullet is fired from the inside, the bullet will firstly hit the flexible layer. The flexible layer can be penetrated by the bullet because its energy is focused on a smaller area; the brittle layer will break due to the flexing of the inner layer and its absence significantly hinders the rate of the bullet
Those are some facts about bulletproof glass. We hope it can be useful for you, readers!