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mdf

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Wienerdog:
20%...  sorry, I was just stating the obvious.  3/4" is 20% heavier than 5/8" but your cab has lots of weight from the monitor, computer, controls, etc.  I'd honestly consider 5/8, because 3/4" is just SOOOO heavy.  A full 3/4" sheet of MDF is around 90 to 100lbs.

crashwg:
The density of the core is expressed as the weight of a one cubic foot (1'x1'x1') block of the material. Therefore, an MDF sheet using a 48# (pound) core, will weigh 102 pounds. (49"x97"x3/4"= 2-1/8 cubic feet)

A 5/8" sheet of the same 48# core would weigh 78 pounds (49"x97"x3/4"=1-5/8 cubic feet)

Lets say you use 3 sheets of mdf on your cab.  3/4" will make your cab weigh 306# and 5/8" will make it weigh 234#.

Only question that remains is which is more important to you, 72# or the beefyness/extra strength of 3/4".

 ;)

the3eyedblindman:
if you put casters on the cab, weight wont be that big of an issue.

cholin:
Even with casters, 72 pounds is a big difference.

Witchboard:
Since you're building with MDF, I would go 3/4".  If you were building with plywood, I would suggest 5/8".  Just my prefs.

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