Formulated polyether polyol developed for the discontinuous production of rigid polyurethane sandwich elements using open lid technology. When reacted with VORACOR™ CE 142 Isocyanate and used with pentane or HFO blowing agents, the system delivers polyurethane foams with excellent mechanical properties, good thermal conductivity, good adhesion to common facings, and short demolding times. The product is suitable for applications such as refrigerated transportation panels.