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Depends on the pump(s) you are using.
We use regular old MDF, with our two 10HP Becker pumps.
If you are using a vacuum cleaner motor, you might want lightweight MDF.
 

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Ask for super refined mdf.

Are you trying to pull vacuum through both the spoilboard and a sheet of 1/4" MDF? 1/4" MDF is much more dense than 3/4".
 
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