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A windscreen or the auto glass in the front of your auto or truck is not made up of a solitary sheet of manufactured glass. It's actually two layers of glass that are divided by a complete layer of polyvinyl butyrate. This layer of PVB essentially glues and also seals the two pieces of glass with each other. This serves several purposes, though one of the most crucial is to preserve the integrity of the windshield. In case of damages, the windshield is much less most likely to ruin.