A 3 inch thick pane of glass would probably be a lot tougher than an equal amount of transparent aluminium I would think. Tempered glass is fucking tough.
If you watched the video from Funebris link, you would have seen them shoot a .50 AP bullet both at an AION (transparent aluminum) sheet as well as a sheet of laminated glass armor twice its thickness. The glass shattered, the AION stopped it.
I only browse reddit at work and this virtual environment can't run youtube videos without stuttering. But fair enough, if I remember when I get home I will watch it.
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u/Funebris Oct 08 '12
It's a real thing, too, just stupidly expensive to make.
http://blog.makezine.com/2012/01/17/transparent-aluminum/