Dimensional stability of polyurethane rigid foams blown with CO2

In recent years, water level in rigid foam formulations has been increased to such a point that the use of only the water/isocyanate reaction to provide all of the blowing has become a reality, at least for certain applications. Nevertheless, two limiting factors penalize the use of only CO2 blown foams: a too high lambda aged value and a poor dimensional stability. The objective of this research work was to record the variations with time of some parameters that affect dimensional stability of only CO2 blown foams, in order to establish eventual correlation between them and foam behavior.