Laminated glass consists of a tough protective interlayer made of polyvinyl butyral (PVB) bonded between two panes of glass under heat and pressure. Once sealed together, the glass "sandwich" behaves as a single unit and looks like normal glass. Annealed, heat strengthened or tempered glass can be used to produce laminated glass. Laminated glass may crack upon impact, but the glass fragments held by the protective interlayer rather than falling free and potentially causing injury.
Laminated glass is the only glass to provide durability, high-performance and multi-functional benefits while at the same time preserving the aesthetic appearance of the glass. Laminated glass furnishes solutions to many architectural design problems and offers increased protection from the effects of disasters such as hurricane, earthquake and hail storm etc.