As a safety glass in the broken by the impact, because of its two intermediate ordinary glass PVB film clips of bonding role, unlike ordinary broken glass after the sharp debris wounding.  At the same time, its PVB interlayer available noise control sunlight and turn it into performance with energy-saving, environmental protection function of new building materials toughened glass broken, the glass is also block crumbled into small particles similar honeycomb-Obtuse-Angle, it is not easy wounding, which has some security.