Bullet-resistant glass installation failure investigation

Show-and-tell artifact: 3 layers of glass + polycarbonate, adhesively bonded, voids forbidden. Military vehicles use ~5-inch laminate; presidential limousine also ~5 inches; rated against shaped-charge anti-tank rounds.

[Tom passes a piece of bulletproof glass around.] Here's a piece of bulletproof glass. It's not just glass — it has glass in it, three layers, and a layer of polycarbonate, all adhesively bonded. The adhesively bonded joints have to be void-free, because otherwise you're looking at a bubble. The major military vehicles actually have something almost five inches thick, and the presidential limousine also has something about five inches thick, so it can take a shaped-charge weapon, an anti-tank round. It's laminated material — just to make transparent armor.