When manufacturing a panel with a polyurethane core pressure and heat are both generated from the expansion of the foam during the foaming process. The skins are set in a large clamping device which functions as a mold. The skins must be held apart from each other to allow the liquid polyurethane materials to flow into the device. Once in the device, the foam begins to rise. The mold/press is generally configured to withstand the heat and the pressures generated from the chemical foaming. The SIP is left in the mold/press to cure slightly and when removed will continue to cure for several days.