PVB film is a macromolecule material molded by polyvinyl butyral resin that is plasticized and extruded by plasticity. It is transparent or opaque, without dirty, and the outer space is flat. There is some adhesive and very soft for this film. Our PVB film with excellent light transparency, heat and cold resistance, elasticity, is well-sticking to inorganic glass and the making of laminated safety glass. It is mainly used in making laminated safety glass. Laminated glass is a special glass which is inserted with PVB film between two layers of common glass, which under high heating temperature and pressure binds to create a slight construction. Because of PVB laminated glass with the function of safety, transparency proof, high or low temperature persistence, heat preservation, noise proof, and ultraviolet resistance, it is used in national defence, traffic, architecture and decorative, and widely used in aeroplane, and space flight ware, military instrument, solar battery, solar energy acceptor and so on.