Polyurethane sandwich panel like most of the sandwich panels is used in roofs and walls consisting two sheets that cover the core of it. This type is much better thermal and sound insulator.
Sandwich panel with polyurethane foam than double energy productivity than polystyrene in the best range of sandwich panels based on mechanical and thermal properties. The used insulation is stiff polyurethane which put the polyurethane structure in the rank of the best thermal insulator; as though, a sandwich panel with 4cm thickness has thermal insulation equaling to the brick wall with 50cm thickness.
Changing insulator properties is possible in polyurethane sandwich for various applications such as the following cases: