Laminated glass, regard as “Safety glass”, consist of two or more panes of glass with one or more layers of polyvinyl butyral (PVB) sandwiched between them and treated. The glass panes can be basic float glass or tempered or heat strengthened panel. If the glass is broken fragments tend to adhere to the PVB interlayer thereby reducing the risk of injury from falling glass and helping to resist further impact or weather damage. PVB membrane has good tenacity performance and when the laminated glass breaks due to violent force, the PVB will absorb a large amount of impact energy and disperse it rapidly. Therefore, it’s hard to break the laminated glass and the shape of the glass may be maintained even if being broken. Furthermore, personnel inside and outside the buildings will not be hurt by the glass fragment.
Burglars often break windows to get to door and window handles, but laminated glass can resist the intrusion because it is virtually impossible to cut through the thick PVB layers even if the glass gets broken.
Laminated glass has proven to be an excellent barrier to noise. It has a higher sound reduction index than monolithic glass of equal thickness between the frequencies of 125Hz and 4,000Hz. The shear damping performance of the PVB makes laminated glass an effective sound control product. This sound dampening is due to the low elastic property of the PVB interlayer.
While natural light plays an important role in architectural design, Ultra Violet (UV) rays in the sunlight can cause itching and fading of curtains/furniture. Laminated glass can block over 99% of the UV rays while allowing most of the visible light through.