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@Greenbank
https://www.woodbin.com/calcs/sagulator/
More for shelves but you can abuse it for desks if you squint at the results.
Just 5kg in the middle of a 2m x 1m span of 12mm thick particleboard (LD-2 particleboard was the one that gave the least deflection) gave a sag of 73.97mm in the middle. That's huge.
The same numbers with 25mm LD-2 particleboard gives 8.18mm sag, still "excessive" according to the site.
25mm thick black walnut gives 3.55mm deflection for the same dimensions and is "acceptable".