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A windshield or the vehicle glass in the front of your cars and truck or truck is not comprised of a single sheet of manufactured glass. It's actually two layers of glass that are separated by a complete layer of polyvinyl butyrate. This layer of PVB generally glues as well as seals the two items of glass together. This offers a number of functions, though the most crucial is to keep the honesty of the windscreen. In the event of damages, the windscreen is less likely to shatter.