In bomb attacks and accidental explosions, bombproof glass can minimize direct damage caused by the extremely high load of the blast wave and the high-speed flying glass fragments, reducing repair costs for attacked facilities or facilities around the blast center. Bombproof glass remains non-penetrating even under conditions where the load from the blast wave energy increases dramatically, several times or even tens of times, with a glass retention value (RET ≈ 1). In contrast, once single-pane glass (including float glass, tempered glass, and insulated glass) breaks, its RET quickly drops below 0.3 once the critical breaking pressure is slightly exceeded, causing glass fragments to scatter and penetrate.
Explosion-proof Function
Globally, bomb attacks (including car bombs and suicide bombings) and terrorist threats are on the rise. The Marriott Hotel incident in Indonesia is a typical example. With the increasing power of bombs, people's lives and property are under extremely serious threat. According to security experts and relevant data, scattering glass and flying fragments are the main causes of injury. In bomb terrorism incidents, 75% of injuries are related to glass, meaning that using bombproof glass can reduce the severity of injury by 75%. If all the glass in a building remains intact within its frame during an explosion, the shockwave energy will not penetrate the interior, preventing damage to interior items; high-speed fragments will also not enter the building or fall to the ground causing injury.
Frame System: The rapidly expanding shockwave and vibrations generated by an explosion are the primary causes of glass damage. Fragmentation originates from the weapon itself and the surrounding environment (e.g., fragments falling due to building shaking). To withstand the destructive effects of a bomb attack, the glass must first withstand attacks from both the shockwave and fragments. Bomb-proof glass and its frame system are calculated using specialized software. Tests can be conducted based on factors such as glass retention, blast impact pressure, shockwave pulse (kPa/msec), duration (milliseconds), and degree of damage. These calculations can determine whether the glass and system will remain intact (glass does not break) or break (cracks appear, some fragments may fall, and some fragments may penetrate) when a bomb of a certain yield explodes. Bomb-proof glass should meet the testing requirements of ASTM F1642-96 standard.
