Acrylic is commonly known as Plexiglas. Same stuff as used in aircraft windshields, canopies and windows.
Polycarbonate is also known as Lexan. Used in motorcycle helmets, most motorcycle windshields and safety glasses.
Polycarbonate is much tougher than acrylic, but it is nearly impossible to remove scratches from polycarbonate.
With regards to polycarbonate's chemical resistance, I had a crack develop in one of the lenses of my PC eyeglasses. When I was getting new glasses, the optician looked at my old glasses and asked "did you use Loctite on your screws?". It turns out that one drop of loctite on PC will cause it to crack.
You can get sheets of acrylic that have a layer of some sort of plastic sandwiched in the middle. This stuff doesn't break as easy as regular acrylic, but it's much cheaper than Lexan.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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