Closed-cell PVC foamboard

Closed-cell PVC foamboard is a light-weight rigid material used primarily in the manufacture of signs and displays, although its material properties have made it extremely popular among model makers and prop builders. Like PVC, closed-cell PVC foamboard is solid and has a very rigid structure. 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. It also has thermoplastic properties, and begins to soften at around 65°C. Typically, closed-cell PVC foamboard can be cut as easily as wood, softened and shaped by immersing in boiling water or with a standard heat gun, and painted with standard automobile paints.

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Alcan Composites produces closed-cell PVC foamboard under the trade-name Sintra®.