> there is a plane that was built with a "better foam" and that airplane was
> falling apart and delaminating and was to cut up into pieces before it killed
> someone.
I assume that was built with polyurethane insulation foam. Which ages and converts to dust after being subjected to vibrations after a few years.
Rohacell, in case you don't know that material yet (don't blame you, it has only become available in the US in the last few years), does not show that behavior. It has a great track record being used in trains, transportation, race cars, aviation and space applications (Delta, Ariane, Boeing, Airbus, rotor blades for helicopters and wind energy...). It's not quite the same as flotation billet or roof insulation foam.