Bulletproof glass is a composite material obtained by special processing of glass (or plexiglass) and high-quality engineering plastics. It is usually a transparent material, such as PVB/polycarbonate thermoplastics (usually lexan resin). Also called LEXAN PC RESIN). It has the appearance of ordinary glass and the act of transmitting light, providing certain protection for the shooting of small arms. The thickest PC board can be 136 mm thick, with a maximum width of 2166 mm wide and effective time of 6664 days.