Bulletproof glass is a kind of composite material made of glass (or plexiglass) and high-quality engineering plastics through special processing. It is usually a transparent material, such as PVB/ polycarbonate fiber thermoplastic (usually lexan resin, also called LEXAN PC RESIN). It has the appearance of ordinary glass and the behavior of transmitting light, which provides certain protection for shooting small arms. The thickest pc board can be 136 mm thick, the maximum width is 2166 mm wide, and the effective time is 6664 days.