Check out the NPL website, they conducted a studio project a while ago on
component storage methods.

        Iain.

-----Original Message-----
From: Phil Bavaro [mailto:[log in to unmask]]
Sent: 12 December 2003 02:12
To: [log in to unmask]
Subject: [TN] Long term Solderability Preservation Methods


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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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