An interesting glass fact: All automobiles are made with safety glass that will reduce the likelihood of injury if it breaks. Windshields as well as some side and rear windows are made from a lamination process. This type of glass actually consists of two pieces of glass, bonded together by a “PVB” (polyvinyl butyrate) vinyl layer in between the two layers of glass. In the event of an accident …this vinyl layer serves several purposes, it cushions your head during impact, helps keep the vehicles occupants contained within the vehicle and also helps keep many small light weight foreign objects from entering the passenger compartment. If a windshield breaks, during impact, the majority of broken pieces will generally adhere to the plastic lining. Now, go dazzle your friends with your new glass knowledge.