Is Bullet-Resistant Glass Really Impenetrable?
Bullet-resistant glass offers protection and security to those behind it. Bullet-resistant storefronts are often installed for banks, jewelry stores, and other high-profile properties. It may also be used for buildings in high-crime areas to keep employees and residents safe.
The Construction of Bullet -Resistant Glass
It doesn’t take a special kind of glass to create a bullet-resistant effect. The glass is made of different layers of polycarbonate plastics situated between layers of glass to help absorb the impact of a projectile or bullet. To make a piece of glass so thick it can stop a bullet, would impact both visibility and communication. With this design, the thickness of the individual plastic and glass sheets determines the level of resistance. The thicker the layers, the greater the resistance.
The glass and plastic layers are bonded through chemicals like polyvinyl butyral and polyurethane. The process takes place in a vacuum to minimize air pockets that could weaken the strength of the bond. Using these chemicals also keeps visibility possible through the glass. Finally, the whole unit is heated and pressurized in order to solidify the bonded layers.
The Work of Bullet -Resistant Glass
Rather than the typical reaction of glass of shattering, bullet-resistant glass can both absorb the impact of the projectile after the initial exterior piercing, or in one-way bullet-resistant glass, spread the impact of the projectile across an inner polycarbonate layer which ultimately can stop the bullet. The energy from the impact is spread throughout the multiple layers, and provided the glass has a higher protection rating than the bullet fired, the projectile will bounce off the glass.