how to tell difference between Perspex and Polycarbonate
take a small piece about 1" x 2" and hold it in a vice. hit it with a hammer or try and bend it with pliers. if it shatters like a CD case........ it Perspex. if it bends but dont snap easily, its polycarbonate...... That's why helmets are made from Polycarbonate rather than perspex! lol
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