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 produces polyurethane foams offering excellent mechanical properties and thermal conductivity, combined with good flowability of the reaction mixture. Good adhesion to common facings and short demolding times are achieved, making the system suitable for refrigerated transportation and related sandwich panel applications.