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What's most scratch resistant?: plexi, lexan, or glass?
Brax:
Tempered Glass
Plexi
Lexan
In that order. Lexan is actually the strongest and therefore, softest. The harder you get, the more brittle your material. Thats why tempered glass shatters when it reaches it's breaking point. Lexan will just flex.
RandyT:
The problem with tempered glass is that you can't cut it. Glass has to be tempered after any work is done on it.
Tempered glass is intentionally filled with internal stresses which is why it explodes instead of breaking along long lines of molecules. Those aligned molecules create the sharp shards when normal glass is broken.
Neither polycarbonate or acrylic is very good at resisting scratches. The best bet is to find some of the "non-glare" acrylic. It has an etched-looking surface that will still scratch, but won't be as noticable. :)
RandyT