Laminated Glass consists of the joining of two or more glass sheets with intercalated Polyvinyl Butyral (PVB) sheets, which is obtained by a thermal and pressure treatment.
PVB is a high strength elastic polymer; In case of breakage the pieces of glass are adhered to the PVB film preventing their detachment and fall.
In practice, the interlayer provides three beneficial properties to laminated glass panes: first, the interlayer functions to distribute impact forces across a greater area of the glass panes, thus increasing the impact resistance of the glass; second, the interlayer functions to bind the resulting shards if the glass is ultimately broken; third the viscoelastic interlayer undergoes plastic deformation during impact and under static loads after impact, absorbing energy and reducing penetration by the impacting object as well as reducing the energy of the impact that is transmitted to impacting object, e.g. a passenger in a car crash. Thus, the benefits of laminated glass include safety and security. Laminated glass also has decorative applications. The interlayer can be colored or patterned.