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Pappy, MR-10 aka "Margard" is indeed scratch-resistant--but sometimes on one side only. Scratch-resistance is a relative thing, any glazing manufacturer should be able to give you comparison figures or even send out a sample piece.
What kind of tempered glass did you get that is stronger than polycarbonate? Or are you comparing inch-thick tempered glass to 1/16" thick low-grade polycarbonate?
Last edited by hellosailor; 05-22-2007 at 05:47 PM.