"FOAM PVC" and "EXPANDED PVC"
The name "foam PVC" comes from its manufacturing process. In the manufacturing process of PVC sheet or profile, a foaming agent is added to expand the hot-melt raw material to generate countless small bubbles, which are extruded at the same time, and then cooled and shaped quickly. Compared with solid PVC, foamed PVC is also hard, but the core of foamed PVC contains air, so it is much lighter in weight.
The name "expanded PVC" is a description of the shape of PVC sheets or profiles. It actually refers to foamed PVC.