Laminated glass (also called sandwiched glass) is manufactured by bonding two or more layers Of glass together with layers of PVB, under heat and pressure, to create a single sheet of glass. When broken, the PVB interlayer keeps the layers of glass bonded and prevents it from breaking Apart. Windshields are typically laminated glasses. The interlayer can also give the glass a higher Sound insulation rating. www.yunhaotrade.com