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In the case of bomb attacks and accidental explosions, bulletproof glass can greatly reduce the direct damage caused by the ultra-high load of the explosion shock wave and the high-speed splash of glass fragments, and reduce the repair cost of the facilities around the attack facility or the explosion center. The load of the bulletproof glass in the explosion shock wave energy is sharply increased, and the penetration is kept several times or even several times, and the glass retention value RET ≈1 is maintained. However, once the monolithic glass (including float glass, tempered glass, and insulating glass) is broken, RET quickly falls below 0.3 as soon as the critical crushing pressure is slightly exceeded, and the glass fragments are scattered and penetrating damage occurs.
Explosion-proof function
In recent years, on a global scale, bombing attacks (including car bombs, human bombs) and terrorist threats have continued to rise. The Marriott Hotel in Indonesia is a typical event. As the power of the bomb increases, people’s lives and property are affected. Extremely serious threat. According to analysis by security experts and related information, the scattering of glass and the splash of debris are the main causes of human injury. In the case of a terrorist bombing, 75% of the damage is related to glass, which means that if bulletproof glass is used, it can reduce the damage by 75%. If the glass of all buildings can remain intact in the frame at the time of the explosion, the shock wave energy will not enter the room, the indoor items will not be damaged; the high-speed debris will not enter the building or fall off the ground. hurt.
Frame system
The sharply expanding shock waves and vibrations caused by the explosion are the main cause of glass damage. The generation of debris originates from the weapon itself and the surrounding environment (for example, the debris is detached due to the shaking of the building). To withstand the destructive effect of the bomb attack, the glass must first withstand both the shock wave and the debris. The bulletproof glass and bulletproof glass frame system are calculated by professional calculation software, and can be tested according to the conditions of glass retention, explosion impact pressure, shock wave pulse (kPa/msec), duration (msec msec), degree of damage, etc. The glass and system can remain intact (glass is not broken), cracked (cracks, some fragments may fall off, have penetrated) when a certain amount of bombs explode. Bulletproof glass should meet the test requirements of the ASTM F1642-96 standard.
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