approx 0.14 per inch. I couldnt find a specific value for plexiglass, but celluloid is about 0.7 per inch, and I would guess that plexeglass is ABOUT the same. However, it is the air gap that is trapped between the layers that really does the insulating, so in your case it wouldn't make much difference if you used glass or plexiglass. Dodgeman
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