PVC Foam Board
PVC foamboard is heavier than foamcore board but lighter than solid PVC It begins to soften at around 65 °C. It can be softened and shaped by immersing in boiling water or with a standard heat gun. It is highly resistant to moisture and some chemicals. Its appealing material properties have made it popular.
One drawback to PVC materials is that hot working them produces noxious fumes. The acid fumes are so serious that they may damage equipment