Closed-cell PVC foamboard is a lightweight rigid material used primarily in the manufacture of signs and displays.
In the 1970s, the need for a strong, moisture-resistant material led to plastic manufactures working with PVC to make it lighter.
[2] PVC foamboard is distinct from the extra-lightweight foamcore board, laminated of foam and card surfaces, used for indoor signage and modelling.
Where it differs is in its closed-cell foam structure, which makes it very light (as little as half the weight of solid PVC), highly resistant to moisture and some chemicals, and very easy to cut and shape.
[6] Its appealing material properties have made it popular among the makers of scale models and theatrical props.
[7] One drawback to PVC materials is that hot working them produces noxious fumes containing hydrochloric acid and potentially even dioxins.
Some heat-based processes, notably laser cutting, are generally considered impossible, owing to the equipment risk.
[8] Where PVC materials are cut by laser, this is a highly specialized process requiring adapted machines and acid-specific fume extraction and filtering.