I just did a small experiment, I had a piece of MDF that I left in water for
about 24 hrs. After inspecting the piece, it hasent swollen a bit, Why are
people saying that MDF under water bubble? I know particle boad will...
Rather than soak the whole thing, let a few drops of water stand on a dry
piece and see if you like the results. That said, MDF does seem to be a
bit more water tolerant lately.
You don't have tempered hardboard do you... Some of that looks like MDF.
I had an experience with MDF that illlustrated its limitations. I have
4 X 4 posts supporting my porch roof. There was an apron of MDF at the
bottom where the posts joined a concrete base. When it rains the porch
would get wet so the MDF would get wet also. (It does not rain often
here.) After three years the MDF started to deform and look ugly. I
finally replaced the MDF with redwood and it tolerates the climate much
I made a table from MDF a while back. I laminated 3 peices of 3/4" sheet for
the legs. I had several scraps left and I have been using one of the pieces
as a wheel chock for my boat. It has been outside for 3 months and gets wet
from the sprinkler system every other day. Same results as you report - no
swelling or delamination.... It looks the same as it did 3 months ago with
just a little discoloration.
MDF Medium Density Fiberboard is make up of fine partials of wood, almost
like saw dust after sanding a board.
Particle board has larger easier to see chunks of wood and reminds me of
compressed shredded wheat.
OSB. Orientated Strand Board has fist sized and a bit smaller thin
laminations of wood.
Read all about it...
and of course
I saw some mdf drawers that became victims of a sudden shower go from 1/2"
to 1 1/2". A single drop of water or sweat would a circular patch
about1/16" high, not that I measured it, we were trying to get the sheets
of it out from under the newly discovered hole in the roof.
Light brown or dark brown?
Was it the (hard to find, but available) water-resistent version?
Let the experiment run for a week.
The MDF I buy soaks up water, but I've never (intentionally) immersed it.
Dark brown strikes me as hardboard (aka Masonite, aka High Density
Fiberboard). They make a really water resistant version, but plain ol'
hardboard is plenty resistant for me.
I made our kid's playhouse out of 1/4" hardboard, albeit painted, but it
stayed outdoors (rain, snow) for a couple of years without much sign of
1/2" is odd. The thickest hardboard I've seen is 1/4".
All the MDF I've seen is light brown .. tan.
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