The board I suggested is much lighter than that. I would guess around 100 kg/m^3.Same material commonly used for a CNC spoil board, makes a better work surface than a sheet of XPS if you're cutting table doubles as an assembly bench. Gets a bit unwieldy if you're in the habit of breaking down between uses though.Trupan Ultralight MDF | Ultralight | Trupan MDF | Medium Density Fiberboard | Products | ARAUCO - ARAUCO
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It is so soft that you can make dents in it with your finger if you push hard enough.
You can also easily put a needle in it, so it has often been used for wall-mounted messageboards.
