Why are car windows & windshields glass and not a kind of plastic?
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My plastics manufacturing professor in engineering school explained it simply like this: you’d go splat against the windshield in an accident because the plastic wouldn’t shatter. There are acrylics that would otherwise be just fine for car windshields and are used in aircraft and in layers for bulletproofing. However, safety glass breaking the way it does is a good thing in accidents where the person hits or goes through the windshield. Since it breaks, your head doesn’t get the full force of impact of you going 60 pretty much into a wall. There’s also getting out of the car in an emergency to consider as well.
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