The labyrinth notch gives this Single Slot Norma Cold Storage Board an excellent sealing effect, and the panel surrounds the notch to prevent damage, deformation, and disengagement while also boosting bending strength. In order to accomplish freezes, the Single Slot Norma Cold Storage Board uses light-weight polyurethane with strong heat insulation capability. This helps to maximize the effectiveness of the refrigeration system by reducing heat transfer caused by the difference in temperature between the interior and outside.