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heaps of manurfacturers use polyc. As a sheet you can buy it as is ,with UV protection one side or UV both sides. Yes it is soft and does scratch but boy is it hard to break. A lot of plastics are prone to crazing from solvents including glues. We anneal large acrylic tube with a hot air gun on a kind of roller system before gluing flat basses on them. This releases the inhearent tension and stops them from cracking when the glue goes off. They remain clear. A sharp blow will shatter 6 mm acrylic, but is unlikely to have the same effect on 6mm poly.
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