Laminated glass is a composite glass product composed of two or more pieces of glass which are bonded firmly with transparent adhesive. Laminated glass is characterized by excellent shock resistance and penetration resistance. Generally speaking, when it is shocked and broken, it will not be penetrated by the external impactors, and the splinters will not fly away from the interlayer, and thus it can provide security. The commonly used interlayer films of laminated glass include PVB, SGP, EVA and PU.