You should seal all case materials with a chemical and/or vapor barrier
sealant. Marvalseal has been around for years and is falling out of use due
to the cost of its labor intensive application. It is an excellent product,
but once it is penetrated the substrate will still off gas.

A new product is Extira, which we have started to use in place of Medex and
Medite II. It is more costly and often limited in availability. This may be
an alternative. I have no information on its oddy results, but fabricators
are making bold claims.
http://www.extira.com/pageBuild.asp?PageID=B_ext_e&UserID=A

Of course, scavengers and moisture control agents should always be
considered. They are numerous and well known.

I would still use the most inert and cost effective substrate available to
you though.
-- 
Brent Ward
Riggs Ward Design
2805 Park Avenue
Richmond, Virginia 23221
804.254.1740  x207
[log in to unmask]
http://riggsward.com



> From: John Martinson <[log in to unmask]>
> Reply-To: Museum discussion list <[log in to unmask]>
> Date: Thu, 20 Jan 2005 07:16:42 -0700
> To: [log in to unmask]
> Subject: exhibit cases
> 
> We are looking to fabricate some museum quality exhibit
> cases for our front lobby.
> 
> Does anyone know what is the best type of wood to use,
> sealer, wood for the back, etc.?  I heard plywood is out
> for backing because of outgasing.  I would appreciate your
> views.  Thanks in advance.
> 
> 
> 
> John Martinson SRA-6117
> Museum Specialist
> Snake River Area Office
> 230 Collins Road
> Boise, ID 83702-4520
> Telephone: (208) 383-2287
> Web: www.usbr.gov
> 
> RECLAMATION 
> Managing Water in the West
> 
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