is like Divinycell. Strong but not as flexible as Airex or Corecell. There are different densities available for most of these structural foams and properties vary with the density. I am pretty certain my deck is cored with Klegecell and I built a couple dingies with Klegecell core. No problems that I know of. I believe it is now sold by Diab Barracuda who also sell Divinycell.