What is this called? I'm not sure of the name or where to buy it. There is a type of plastic that has a corrugated inside like corrugated cardboard, and 2 smooth surfaces on the outside. Ikea uses it in some of their furniture, like to make translucent "windows" in a cabinet. IÂve also seen it used to make semi-rigid file boxes. It's very rigid and lightweight. Like foam core but all plastic, no foam inside. It can be scored and folded easily. Does anyone know what this stuff is, or where to buy it?

IÂm not sure where to post this, so IÂm trying several places in hopes someone has used it.