About Our Bulletproof Glass

Bulletproof glass is a composite material made of glass (or plexiglass) and high-quality engineering plastics through special processing. It is usually a transparent material, such as PVB/polycarbonate thermoplastic. It has the appearance and light transmission properties of ordinary glass and can provide a certain degree of protection against small arms fire.

The level of protection provided by the glass depends on factors such as the thickness of the glass, the composition of the layers, and the type of ammunition it is designed to resist.

The principle of bulletproof glass

It mainly prevents bullet penetration by converting the kinetic energy of the bullet into the elastic potential energy of the glass and the surface energy of the fragments. ‌ When a bullet hits bulletproof glass at high speed, it first hits the outer layer of glass, causing the outer layer of glass to break, forming radial cracks, and the kinetic energy of the bullet is greatly reduced. The breakage of the outer layer of glass will change the shape of the bullet or directly decompose the bullet, further reducing its penetration. Even if the bullet penetrates the outer layer of glass, it will lose a lot of kinetic energy in the interlayer and cannot cause effective damage to the target behind. ‌

Bulletproof glass usually consists of a multi-layer structure, including high-strength glass and polycarbonate material layers. The high-strength glass layer breaks first when the bullet hits, absorbing most of the impact energy, while the polycarbonate material layer further absorbs the remaining energy, preventing glass fragments from splashing and protecting the human body. This multi-layer structure design enables bulletproof glass to effectively disperse and absorb energy when it is impacted, ensuring the safety of people inside.

Bulletproof glass has a wide range of applications, including military equipment, police vehicles, bank counters and other places that need protection. Its design standards vary according to different protection needs, and are usually divided into multiple levels to ensure appropriate protection in different threat environments.

Structural Composition

Bulletproof glass is actually made of transparent adhesive materials that bond multiple pieces of glass or high-strength organic sheets together. Generally, there are the following three layers:

Bearing layer: This layer is the first to withstand the impact and break. Generally, thick and high-strength glass is used, which can destroy the bullet or change the shape of the bullet, making it lose the ability to continue moving forward.

Transition layer: Generally, organic adhesive materials are used, which have strong bonding and good light resistance, can absorb part of the impact energy and change the direction of the bullet. A very strong and transparent chemical film is sandwiched in the laminated glass. This can not only effectively prevent bullet shooting, but also has the performance of surge resistance, explosion resistance, shock resistance and no cracks after impact.

Safety protection layer: This layer uses high-strength glass or high-strength transparent organic materials, has good elasticity and toughness, can absorb most of the impact energy, and ensure that bullets cannot penetrate this layer. The most important performance indicator of bulletproof glass is bulletproof ability. The indicator of bulletproof ability is measured from two aspects, one is safety protection ability, and the other is the lethality of the protected gun.

Basic Classification

According to the different degrees of protection for the human body, bulletproof glass can be divided into two types, one is safety type and the other is life safety type. After being shot, the safety bulletproof glass has no splashes on its non-bullet surface and does not cause any harm to the human body; after being shot, the life safety bulletproof glass has splashes on the non-bullet surface, but the bullet cannot penetrate the glass, which may cause secondary damage to the human body. Bulletproof glass has different requirements for its bulletproof ability according to different types of guns. Bulletproof glass is divided into three categories: the first is aviation bulletproof glass, the second is bulletproof glass for vehicles and ships, and the third is bulletproof glass for banks. The thickness is between 18mm and 40mm.

Bulletproof glass is a special glass with high safety performance that can keep the glass intact or non-penetrating damage under a bomb explosion attack of a certain equivalent without breaking out of the frame.

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Fever L.//SMC Editor