Some bulletproof glass only works one way

Moment at 0:16 in Bulletproof Glass Is Made To Break 🤯 by Mildly Informed.

Bulletproof glass isn't one super-hard sheet. It's several layers of laminated glass with a layer of polycarbonate plastic on the inside. When a bullet hits, the outer glass shatters on purpose, spreading the bullet's energy over a wide area, and the tough plastic on the safe side holds back the bullet and the broken glass. More layers mean more protection: real panes are about 19 to 89 mm thic

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