The Feldherr looks very similar to an Elmer’s brand I cut several months back. Same black color throughout. The Elmer’s I had on-hand is thinner at 0.22". The settings I ultimately settled on was worthy enough to put into my journal under “Foam Board” (notes section contains part number)
The card stock “skin” remained intact, but the laser will cause the sandwiched middle foam to retract severely… like rolling an eraser “marble” throughout the edge. If the project relies on those edges to be perfectly 90º straight, this type of board will disappoint.
In my case, I was using it to just make rigid signage. Oversized tabloid-size paper printed on a wide-format Epson, then spray-adhered to this type of foam board, followed by using the Glowforge to cut perfect holes for hanging.
This wouldn’t be the type of board I’d use to create anything structural that brings attention to the edges (square tooth joints)
I didn’t see any flaming of my foam at the thickness & settings I was working with, but for your 10mm version, the further slowdown in head speed required might yield very different (worse) characteristics… and it’s certainly much taller than what could slide through the Pro’s slot.
The Elmer’s version is a huge poster-board size, but wasn’t too difficult to trim down using a straight-edge and a fresh box cutter blade.