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December 2003

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Subject:
From:
Mike McMonagle <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 12 Dec 2003 08:50:14 -0600
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Phil,

Instead of just a standard dessicant, look at the Mitsubishi RP system
at http://www.mgc-a.com/rpsystem/mgca.html to inhibit oxygen and
corrosive gases for such long-term storage.

Mike

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Bavaro
Sent: Thursday, December 11, 2003 8:12 PM
To: [log in to unmask]
Subject: [TN] Long term Solderability Preservation Methods


Does anyone have any good suggestions for storage methods when business
reasons require an end of life buy of a PLCC which has a tin lead
coating on it and the quantity will last for the next six years of
production?

Obviously these need to be kept as dry as possible, in an
environmentally controlled, esd protective dark/cool location, but the
practical storage issue of what container to place these in (several
pallets worth),  strategic separation (in case of a fire or other
disaster) and security are also at hand.

I am not sure what the shelf life is for the best moisture vapor barrier
bags but I am thinking of double bagging the parts so that we can get
rid of the card board boxes they are in.

I am considering storage at cooler temperatures to slow down the
oxidation rate, but what about "nitrogen" purging before pulling the
vacuum on the
parts.   Will either of these methods make a difference?

It has been a while since I have worked on a program which kept stock
for anything longer than two months.

We brainstormed some pretty wild approaches to this today so I know that
my management is pretty open to anything still at this point.

Obviously lead free will not be a factor for this product until our
stockpile is depleted.

Thanks in advance.

Phil

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