Uncle those sheets will give you exactly enough info to get someone hurt or worse in my world.
The D-50 and the D-100 were balsa. In the test and some cross-linked foam was in there happily failing as well.
And as for the Balsa I would not use it in anything aside from a flower Planter I have been using these high end Foams for almost 30 years now.
Infusing Balsa LOL is exactly that!! the core gets filled with resin as well. Core Cell a third generation core is a SAN Plastic an Engineering material itís real world uses include the gas tanks on cigarette lighters aside from 100ís of other uses yes in the old days we used Airex with no problem check your little sheet there it will have the highest peel strength also.
Look it is quite simple we have say a large china dinner plate supported and a piece of Lexan so we start to load them the plate will appear stronger then disaster it shatters but the lexan is still assuming loading. Airex is made in Switzerland there was a pictue of one of our boats hanging in their office there.