Even if the laminated glass breaks, the fragments will be stuck on the film, the broken glass surface will remain clean smooth. This effectively prevents the occurrence of debris stabbing penetration falling events ensures personal safety. In Europe the United States, most of the building glass are laminated glass, which is only to avoid injury accidents, but also because laminated glass has excellent seismic invasion ability. The middle membrane can resist the continuous attack of hammer, firewood cleaver other weapons, can also resist the penetration of bullets for a long time. Its security degree is very high. The glass may break under the impact of heavy ball, but the whole glass still remains an integral interlayer, the broken pieces sharp small pieces still stick to the intermediate film. When this kind of glass is broken, the fragments will be scattered, it is mostly used on vehicles such as automobiles. Toughened glass needs a large impact force to break. Once broken, the whole glass bursts into numerous fine particles, only a few broken glass are left in the frame. Ordinary glass will be broken as soon as it is hit. In a typical broken state, there are many long sharp pieces. When the wired glass is broken, the mirror tooth shaped fragment surrounds the hole, there are many glass fragments around the penetration point, the length of the broken wire varies.