Fig. 1 Microscopic view of the pore structure of a 32 kg/m³ polyurethane foam.

Fig. 2 Thermal conductivity of PVC⁸, Teflon⁹ and Nylon⁹.

Fig. 3 Cell gas pressure variation with time for a 25 mm thick PU foam sample blown by CO2 and R11.

Fig. 4 Thermal conductivity of commonly used gases [Touloukian, Liley, and Saxena, 1970].

Fig. 5 The experimental setup for the thermal conductivity measurement.

Fig. 6 Details of the test section

Fig. 7 Comparison of theoretical predictions of thermal conductivity with measurement results. Atmospheric pressure case.

Fig. 8 Comparison of theoretical predictions of thermal conductivity with measurement results. Evacuated case.