name Styrofoam
** sometimes polystyrene paper (PSP)
* Polyurethane (PU) foam
** LRPu low-resilience polyurethane
** Memory foam
** Sorbothane
*Polyurea foam
*Polyethylene foam, as used in PEF rod
* Polyvinyl chloride (PVC) foam
** Closed-cell PVC foamboard