PVB film is a macromolecule material molded by polyvinyl butyral resin that is plastificated and extruded by plasticity DHA. PVB film, with the excellent light transparent performance, heat resisting and cold-resisting, elasticity, is well-sticking to inorganic glass and becoming the best gluey material in the world of making laminated safety glass at present. PVB film is the semitransparent membrane, with no impurity, flexibility and smooth surface. Though there is certain roughness, it has well intensity of stretch proofing and extension at break.