The intensive study of some physical properties can detail even
more the adsorption capacities of the different tannin rigid foams
amongst the 30 samples, corresponding to the experimental categories
in the DOE. With this scope, six well known physical
characterization trials were performed on three tannin rigid foam
categories, one for the optimum foam sample (labeled M15), one for
a medium efficiency (M15) level and a last one for a low adsorption
capacity (M7). Comparisons amongst them will give us structural
reasons that will probably explain these differences.