You didn't tell us that a foam sandwhich construction was used, you said it was a new hull MATERIAL.

You wrote :"Anyway our material has a FINISHED (processed) density of 1.5 grams/cm3 (g/cc). It has a glass content of 60% by mass and 35% by volume"

No mentioning of any foam content here.

Apparently, with the new post, the only new thing about this material is that it uses some other stuff to replace the poly-, vinyl- or expoy resin in otherwise the same setup.

Can we call it a new resin then; instead of a new material ?

Or are you calling Kevlar reinforced laminate a new material as well ?

Wouter