In fact, those who use logic have already given the answer by themselves. For those who are curious about the details of our subject, let's learn how it protects the people behind the bulletproof glass from the danger.

In fact, those who use logic have already given the answer by themselves. For those who are curious about the details of our subject, let’s learn how it protects the people behind the bulletproof glass from the danger. Of course, the secret hero here is nothing but plastic. If you are at the front, if you are exposed to bullets in all directions in the danger zone, you need all the help you can get. When no one can see that he’s not coming, he can’t move fast enough to get over the sniper bullet. There is only one way to protect yourself, which is to have a barrier in front of your body that will dissipate the energy of the bullet. This is the basic idea behind bulletproof glass.

How did bulletproof glass/plastic come out?

Modern bulletproof glass is a diversity on laminated safety glass and was invented by Édouard Bénédictus (1878–1930), a French chemist who patented his idea in 1909. In its original version, it used celluloid (early plastic). The idea of using polyvinyl plastics in laminated glass sandwiched between two glasses was first proposed by Earl Plate of Pittsburgh Plate Glass Company (1936).

How does bulletproof glass/plastic work?

At first glance, bulletproof glass looks the same as any window glass, but that is where the similarity ends. An ordinary piece of glass becomes like salt with a bullet. Bullet resistant glass is manufactured to withstand several bullets. What gives these glasses the ability to be bulletproof?

Various manufacturers produce various types of lead-proof glasses, but these are made by simply layering polycarbonate (multi-carbonate) material between ordinary glasses. This process is called lamination. Polycarbonate is a hard and transparent plastic. Bulletproof glass has a thickness of 7 mm to 75 mm. A bullet fired on the bulletproof glass will penetrate the outer layer, but the polycarbonate glass material formed in layers prevents the projectile from absorbing its energy and exiting the last layer.

The ability of bulletproof glass to stop the projectile is determined by the thickness of the glass. Bullets from a series of firing guns collide with a large number of glass, unlike shots fired with a regular handgun. In this case, a thicker bulletproof glass is needed.

There are also unidirectional bullet-proof glasses that allow the lead to pass in one direction while holding bullets in one direction. This will allow anyone to respond to the attack. In this type of bulletproof glass, delicate and flexible material is used.

Let’s say a vehicle is equipped with a one-way bulletproof glass. If anyone shoots from outside, the bullet hits the delicate side first. This delicate material disperses around the impact point and absorbs some of the energy in a large area. The flexible material stops the lead, then absorbs the remaining energy of the projectile. The internally fired projectile easily passes through the glass because the force of the projectile concentrates on a small area. This makes the material flexible. In this case, the delicate material breaks outward, allowing the projectile to pierce the flexible material and hit its target.

Where is Bullet Proof Glass / Plastic Used?

Bulletproof glass is generally used for protection in stadiums and arenas, accommodation, financial institutions, station markets, schools and police stations. There are places for other uses, including cars and transport units.

Bulletproof windows allow your company to do business while keeping workers safe. To be truly effective, bulletproof glass should provide a protective barrier while facilitating product exchange and communication by employees.

Stadiums and Arenas

Stadiums and arenas usually accommodate box office workers who are exposed to a large crowd at one time in areas with high traffic. These locations are usually based on specially sized windows for efficient exchange of payments and tickets. These windows provide an additional benefit to keeping employees warm, while the box offices are useful when they are out, too.


Staff at hotels and motels must be on duty 24 hours a day, 7 days a week. Because the lobbies are always precarious, the hotel staff will be in the way of all kinds of pedestrian traffic. By placing these employees behind bulletproof windows, hotels and motels can keep the front desk staff safe 24 hours a day.

Financial Institutions

The history of security problems in banks is well known. Bank robberies are not as easy as they once were with security cameras and security guards, but sometimes they do. Bulletproof windows are now installed in banks and credit unions to protect employees who interact with customers.

Station Markets

Like hotels and motels, shops usually remain open 24 hours a day. Because of the security issues that this situation brings, these places may find it difficult to find and retain good employees. By building bullet-resistant products, workplaces can provide a safe space for workers while providing a clearance that can be passed through larger items such as cigarette cartons.


While schools are a safe place for students and teachers, many tragedies over the years have proven otherwise. School administrators are now taking measures to protect school systems by demanding that all visitors pass through a front office to reach a locked area. With the installation of bulletproof windows, the door guard can also safely protect all visitors.

Police Stations

Bulletproof windows in police stations, although they have been needed for a long time, are relatively new in many cities. When bulletproof products are used in the lobby, police stations can keep visitors, officers and administrative staff safe while serving the public. There are options that can work within the local government budget to make the security authorities feel safe while working at the station.

How is bulletproof glass produced?

Conventional bulletproof glass is made of plastic (typically 3–10 mm); wherein the plastic is a thin polyvinyl butyral (PVB) film (about 1-3 mm). For newer, stronger bulletproof glasses, they use glass sandwiches made of glass and plastic, normal plastic, ionic plastic polymers, ethylene vinyl acetate or polycarbonate. Plastic sheets separated by thick plastics and thin films of various plastics are like PVB or polyurethane. Bulletproof glass is mainly a multilayer glass and plastic sandwich. However, there are many different ways to arrange materials. In this example, there are a plurality of glass layers with a thin layer of polycarbonate and thin plastic intermediate layers that connect them together. However, many other arrangements are possible.

In order to make a simple PVB based bulletproof glass, the thin PVB film is laminated, heated and compacted between a thick glass. Thus the plastic melts and adheres to the glass. Often this process takes place in a vacuum to prevent air trapping between the layers. This affects the weakness of the laminate and its optical properties (distortion of passing light). The unit is then fully cooked in an autoclave (some kind of industrial pressure cooker) at a much higher temperature (about 150 ° C) and pressure (about 13 -14 times normal atmospheric pressure). The main difficulty with the process is to ensure that the plastic and glass sheets adhere properly without air trapped between them, and that the heat and pressure of the autoclave do not degrade the plastic.

What is Polycarbonate?

Polycarbonate is a thermoplastic polymer. Polymers are large molecules consisting of structural units that are repeated in long chains. There are both natural and synthetic polymers. Examples of natural polymers include wood, rubber, cotton, wool, leather and silk. Synthetic examples include polycarbonate, plexiglass and PVC. Thermoplastic polymers are a type of liquid which contains a process that can be completely reversed and repeated since it hardens when heated and cooled. Polycarbonate is an ideal application in that it has very high strength in bulletproof glass and is optically transparent. Polycarbonate is generally used as a soft material in bulletproof glass. Because it can bend backwards while holding pieces of broken glass in place. It is 30 times stronger than polycarbonate acrylic. This is 17 times stronger than a sheet of equal thickness.