I received some practice materials from a nearby sign shop. Can anyone help me with what this is? Shiny on both sides - super light weight. Thanks!
the edge looks kind of like PVC with those pores (bubbles in pvc), but it could also be HDU with a coating on the faces.
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If I’m correct it’s sign foam. Nice stuff
high density urethane (signfoam.com)
oops , sorry @SethCNC
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no need to be sorry. We’re on the same page, I’m pretty sure its HDU, especially since she got it from a sign shop.
I’m sure the full name, the link and the photos there will help Susan determine. 
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Thank you Seth & Ken! Sure enough - HDU! I very much appreciate your help!
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