The regulations stipulate windshields must be made of laminated glass, insulated glass (a Multiple Glazed Unit), bullet resistant glass or (except in convertibles or other vehicles without a roof) glass-plastic. It also allows for equivalent-or-higher performance materials that may be developed in the future but are not covered by the current standards.
Windshield glass is all laminated.
The regulations stipulate windshields must be made of laminated glass, insulated glass (a Multiple Glazed Unit), bullet resistant glass or (except in convertibles or other vehicles without a roof) glass-plastic. It also allows for equivalent-or-higher performance materials that may be developed in the future but are not covered by the current standards.