Bulletproof glass latest quotation and customization in Zhuhai; how the multi-layer composite structure of bulletproof glass enhances safety protection.
Release time:
Mar 29,2025
Bulletproof Glass: How Multi-Layered Composite Structures Enhance Safety Protection
Bulletproof glass is a type of safety glass made of multiple layers of glass and high-strength polymer materials. It can withstand bullets, high-speed impact objects, and even explosive fragments. Its core protective capability comes from the energy absorption and dispersion mechanism of the multi-layered structure. It is widely used in banks, military and police vehicles, and high-security buildings.
1. Multi-layered Composite Structure of Bulletproof Glass
Bulletproof glass is usually made of tempered glass and high-polymer interlayers (such as PVB, SGP, or polycarbonate PC) alternately stacked to form a combination of rigid and flexible layers. Common structures are as follows:
- Outer layer (first line of defense): Tempered glass, used to withstand the initial impact, slow down the bullet's speed, and cause it to deform or shatter.
- Middle layer (energy absorption layer): PVB (polyvinyl butyral) or SGP (ionomer interlayer), which has high toughness and high viscosity, can absorb bullet kinetic energy, prevent glass fragments from scattering, and improve overall strength.
- Inner layer (final blocking layer): Uses thicker glass or polycarbonate (PC), responsible for completely absorbing the remaining impact force to prevent bullet penetration.
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2. How does the multi-layered structure enhance safety protection?
① Layer-by-layer absorption of impact energy
- When a bullet hits the bulletproof glass, the first layer of glass breaks, dispersing some of the energy.
- The bullet enters the middle layer (PVB/SGP), and its kinetic energy is absorbed by the polymer material, slowing its speed.
- The remaining kinetic energy is consumed by the final layer (PC or reinforced glass), preventing the bullet from penetrating and protecting personnel safety.
② Improve explosion resistance and earthquake resistance
- Due to the high toughness of the interlayer material, bulletproof glass will not produce a large number of fragments under the action of explosion shock waves, reducing the risk of secondary damage.
- The use of bulletproof glass in high-rise buildings and bank counters can effectively prevent impact shock from causing damage to the interior.
③ Different levels of protection capabilities
According to international standards (such as EN 1063, UL 752, etc.), bulletproof glass is divided into protection levels:
- BR1-BR3: Can withstand small-caliber handgun bullets (such as 9mm), suitable for shops and anti-theft doors and windows.
- BR4-BR6: Can defend against high-power rifles (such as AK-47, M16), used in military and police facilities.
- BR7 and above: Can resist armor-piercing bullets, used in armored vehicles, embassies, and other high-security environments.
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3. Additional strengthening technologies to enhance bulletproof performance
SGP vs. PVB interlayer: SGP is tougher than PVB and can withstand greater impact forces, suitable for high-level bulletproof glass.
Polycarbonate (PC) composite glass: PC has extremely high toughness, reducing the possibility of damage and improving explosion resistance.
Optically transparent coating: Some bulletproof glass uses special coatings to ensure high transparency and protection capabilities.
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China Guangdong Haibo Special Glass Technology Co., Ltd. Unified Social Credit Code: 91440101MA5AT33G12 Contact Numbers: General Manager Cao, 13178822749; General Manager Wei, 13533794186.