PEL-SIL 9736 is a new generation of silicone surfactant which is polyol compatible and especially designed for the latest blowing agents. PEL-SIL 9736 silicone surfactant is designed for rigid foam systems. This surfactant may be used in high water formulations or HCFC 141b formulations. It may also be used with high water and HCFC-22 or with all three blowing agents. PEL-SIL 9736 with the above blowing agent will produce foam with excellent flowability, a high percent of closed cells and excellent initial and retained k factors.