[EricH]

Originally Posted by Mentor_Mike

I don't think it matters. What's important is that the armour doesn't shatter when a ball hits it.

Or something else...

In 2005, my team had one acrylic (plexiglass) panel, out of 4 surrounding our mast. The other three, as well as defensive wedges on the sides, were polycarbonate (lexan). Guess which one cracked under a robot hit at our first event? It was replaced with the other material.