PVC foam is also referred to as Sintra, which actually isn't anything like EVA foam. It's a closed cell foam extruded plastic sheet, which can be bent with a heat gun, and retains a rigid structure, it isn't at all flexible like EVA. It's moderately strong, easy to sand and takes paint very well, but it scratches and dents easily and can be difficult to work with if you're looking for complex curves, like you would need on an iron man suit. If you're are hoping to be able to heat bend it, I wouldn't recommend anything thicker then 1/8", otherwise you'll have alot of trouble actually bending it. It certainly has it's uses, and can be used for full armor builds, I made a full Farseer cosplay based on sintra for the armor pieces which I then coated in fiberglass for stability, but defiantly get some sample and practice with it before committing to buying a ton and fabricating a suit with it.