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April 2006

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Subject:
From:
Jeffrey Bush <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jeffrey Bush <[log in to unmask]>
Date:
Fri, 28 Apr 2006 12:30:23 -0400
Content-Type:
text/plain
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text/plain (67 lines)
We store HASL and ENIG for 3 years, while Silver and tin are 1 year.

Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED 
           76 Technology Drive - POB 1890 
              Brattleboro, Vermont 05302
                Voice - 802.257.4571 ext 21
                    Fax - 802.257.0011
                       <http://www.vtcircuits.com/> 
                           

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Friday, April 28, 2006 9:03 AM
To: [log in to unmask]
Subject: [TN] Shelf life of circuit board plating

Good Friday Morning All,
 
This topic may have been previously discussed, but let me try to phrase
my "problem" completely so the answer can be simpler.
 
I have a board vendor (Fab house) stating that for my ENIG boards the
plating only has a 6 month shelf life if the package is opened.  Did I
miss something here?  I thought Gold doesn't tarnish.
 
If this is true, then Immersion Tin, Immersion Silver and ENIG all have
storage issues.
 
OK, so I open a sealed package and take out half of the boards in the
package.  I may not need the rest of the boards for many months.  So how
do I protect the unused boards?  Should I vacuum seal them?  Add a
desiccant?  If I add a desiccant, are there different desiccants which
might damage the boards?
 
I'm sure I'll have more questions right after I send this.
 
Phil

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