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Here's a project I have had on my mind for a long time. Upgrading my wood router table to some sort of a new flat table. My existing table is one of those that is made from MDF, which when new is flat, but over time many of them develop a bow or dip in the middle. This appears to be partially due to the constant weight of the router on the MDF ...
Watch it on Youtube: https://youtu.be/_GfivHG_9C0
but is also likely caused by the fact that the MDF does absorb moisture (like all wood products) and in the process it makes the wood or in this case MDF, expand. Since the MDF cannot expand on the top because of the glues on arborite or plastic laminate, the MDF can only bow upwards on the sides, which is what can cause the center to drop. In my case over a sixteenth of an inch.