Bullet Resistant Glass
BRG glass compositions vary but most common are HST laminated manufactured from several layers of glass bonded together with tough polyvinyl butyral (PVB)/ Ethylene Vinyl Acetate (EVA) interlayers.
The resistant requirements determine the number, and thickness of individual glass layers, thus affecting the overall thickness and weight. On impact the front layers of glass are designed to absorb the bullets initial impact energy by shattering allowing the subsequent glass layers and PVB to absorb the lower level shock waves.
BRG with Polycarbonate layer:
Some BRG compositions include the use of a polycarbonate layer. Polycarbonate is lighter and stronger than glass and its use allows the manufacturers to reduce overall thickness and greatly reduce weight, especially in no spall variants.
