Assumptions regarding structure and heat transfer mechanisms and predictions made by a variety of thermal conductivity models^{42,43,47,48,106,113,116,122}.

Assumptions	References	Conclusions	References
Cells have a uniform size distribution	42, 43, 47, 106, 113 and 122	Conduction is the most significant mode of heat transfer	42, 43, 47, 48, 106 and 122
Considering only the average cell size is representative of the whole	42, 43, 47, 106, 113 and 122	Generally, reducing cell size reduces thermal conductivity	43, 47, 106, 113 and 122
Cells are generally spherical (isotropic)	42, 43, 47, 48, 106 and 122	Generally, increasing void fraction reduces thermal conductivity	42, 43, 47 and 116
Cells are closed	42, 43, 47, 48, 106, 113 and 122	Nanocellular foams display different trends than microcellular foams	47, 48 and 113
Convection is negligible	42, 43, 47, 48, 106, 113, 116 and 122	Impact radiation increases for high void fraction (low relative density) foams	42, 47 and 122
Radiation is ignored	48	Refractive index and absorption index have a significant impact on thermal conductivity	47 and 106
Reflectance and refraction index is constant for all cell sizes and void fractions	42, 43, 48, 106, 113, 116 and 122	Reflectance depends on cell size, void fraction, etc.	47
Consider only foam structure and primary material. No consideration for blends or additives	42, 43, 47, 48, 106, 113, 116 and 122	Width of cell size distribution is significant	48
Cell wall thickness remains essentially constant as cell size is changed	113	Changes in cell wall thickness and ratio of polymer present in cell walls to struts significantly impact thermal conductivity	113