IIRC it's Lexan, a polycarbonate, that is much more durable. You can actually bend it, cut it (it will melt from the heat but not shatter), and you can drill into it

Yes those are some of polycarbonate's properties. It also stops bullets in 1"+ thicknesses. It's what is used for "bulletproof glass." Polycarbonate has a bit of a gray cast to it, especially in the thicker sheets. It's also a little tougher to polish up, but is less sensitive to the blades used to cut it than is acrylic. It is also more costly than acrylic. Personally, I wouldn't recommend it for this application.

Stu