Foam core PVC is fairly rigid, it just isn't very strong. You can sometimes make a dent in it with your fingernail. It is used primarily in the sign industry for making those inexpensive signs you see out on the road. That and expanded core PVC are not the best materials for making reptile enclosures with in my opinion, however I am highly biased towards hollow core PVC - it's how I make my living. It is 100% pure PVC. If you want to buy something in a sheet though, you can buy sheets of 100% pure PVC...it is a little more expensive but it is well worth it as it is FAR better.
Thanks,
Paul Edwards Reptiles/ProTek Caging Systems
843-224-8985

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