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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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