Windshields are constructed from laminated glass. This laminated glass is composed of two or more layers of glass, with a thin plastic sheet in between. This transparent sheet of plastic is actually called polyvinyl butyrate, or PVB, and is fused between the layers of glass in an adhesion process which utilizes pressure and heat to bind the layers together.

The PVB film keeps the glass from shattering in the event of an accident. On impact, most of the glass is kept from entering the vehicle’s cabin, and can even act as a retainer to keep objects, including you, inside the vehicle.

The windshields of all vehicles are constructed from a type of glass known as laminated glass. This type of glass is different than what is used for the rest of your vehicle’s windows. Used since 1927, laminated glass is created by placing a thin sheet of adhesive plastic between two layers of glass. This transparent plastic is called polyvinyl butyrate, or PVB, and is infused with the glass using extreme pressure and heat. The PVB sheet holds the glass together in the event of impact, and prevents the windshield from shattering. This helps prevent further injury to the occupants that may be caused from the shattered glass.