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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
... [Read Article]
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