Plexiglass is not very tough and can shatter on impact.
An ordinance manufacturer used 3/8" thick ploycarbonate (GE's "Lexan", "Hyzod", or "Tuffak") for gurds surrounding military grenade assembly machines. We detonated one in a verification test and the sample guard stopped the shrapnel very well. Banks and gas stations use 1 inch thick polycarbonate in those bullet-proof customer windows.
Polycarbonate is tough but surface scratches easily. It's the same material used in modern headlight lenses and those hard-to-open theft-resistant packages. Years of exposure to sunlight can yellow and cloud the surface the same as headlight lenses. The rear windows in 1970's John Deere Sound-Guard cabs appeared to be polycarbonate.
The material cuts and drills easily, is somewhat difficult to bend into shapes, but it welds very strongly with the proper adhesive.
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Today's Featured Article - Threshin Demonstration - by Michael Delaney. Introduction I bring you greetings from Prince Edward Island, Canada. We are Canada�s smallest province but big on farming. Maybe you�ve heard of us. Potatoes are our biggest crop. However, there is lots of mixed farming here also. I have a small mixed farm with 25-30 cattle. I make very good use of old machinery. I have a 135 MF Diesel, Farmall H and 1/3 share in an Allis B. I have complete lines of tillage and harvest equipment, and a saw gear etc. I have everything one would
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