Polyvinyl butyral interlayer is a thin film of uniform thickness that has been processed and extruded from PVB resin mixed with plasticizer and additives. Its unique characteristics are: impact resistance, penetration resistance, sound insulating, and UV-proof. Moreover, PVB film can hold the debris from shattered glasses to protect the end users. Currently, most automotive windshields are required to adopt PVB laminated glass. PVB films are also used for the glass on high-rises and landmark architectures.