I have encounter resistance from a mentality type of folks
that strongly argue that HASL boards need to be etched and replated
after 12 months.  These people recommend TIN/LEAD uplating instead of
HASL if the boards are not going to be used within a year. Their
argument is that the intermetalics in the barrels would render the
boards unsolderable. Any thoughts on this mater?
        Ramon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Franklin Asbell
Sent: Tuesday, August 09, 2005 4:01 PM
To: [log in to unmask]
Subject: Re: [TN] PCB Storage

While I certainly do not recommend this practice, I had some boards in
my desk for 5 years, under some papers, beneath a box...I had
'forgotten' they were there, just for kicks I soldered them without bake
and they looked good.

For storage in an office (or controlled)environment I would suggest
vacuum seal with dessicant for the environment you suggest. Time in
itself for that period should not be an issue, just keep them sealed and
they may last up to
7 years or more.

Franklin

-----Original Message-----
From: Black, Paul [mailto:[log in to unmask]]
Sent: Tuesday, August 09, 2005 2:32 PM
To: [log in to unmask]
Subject: [TN] PCB Storage

Hi All,

I have some bare PC boards that may be built up in the future, but not
in the near future. I would like to put them into storage until needed
(anywhere from 6 months to 2 years). The boards are .062" FR-4 HASL
boards.
What would you recommend  for protection, assuming that the storage
conditions are typical of an office environment? Would I have to do
anything special to them when they are removed from storage? Any
suggestions would be greatly appreciated.

Thank you,
Paul Black
Manufacturing Engineer
Kronos
E-mail: [log in to unmask]

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