[GreenKeys] plastic decay (was: 28 printing reperf hammer redux)

[Ed Sharpe Archivist for SMECC via GreenKeys]

microfilm too.....  have some great stuff that smells like pal neuman  
salid dressing...
 
 
In a message dated 2/11/2015 8:25:44 P.M. US Mountain Standard Time,  
douglas-w-jones at uiowa.edu writes:

The one  exception is old acrylic parts.  If stored in a closed container,  
any
depolymerization will release acetic acid, and this seems to  accelerate
the depolymerizaiton.  This is called "vinegar disease"  because of the 
smell
of acetic acid that is rather overwhelming when you  open the sealed 
container
where this kind of decay is going on.   Acrylic parts need to be ventilated 
for
longevity.  The motion picture  industry is very sensitive to this problem, 
as
once vinegar disease sets in  on a reel of film, it can be very destructive,
and in a stack of reels of  film, it can spread from reel to reel.  I had an
"infected" stack of  microfiche once.  It was pretty  awful.
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