how to tell plexi from other plastics

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Is there a definitive test to determine which plastics may be plexi as opposed to another type? I've acquired a few signs that I was told was plexi but the previous owner was not sure.

Thanks,

Brian
 

btboone

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Roswell, GA, USA.
Polycarbonates have rubbery shavings if you scrape it with a knife or file. Acrylics have whiter chips that are crinkly. The smell of each is unique when machining it. The acrylic seems to have a somewhat sweet smell and polycarbonates smell more rubbery. I'm sure there must be more scientific ways to tell.
 
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