I believe the use of cold storage may be intended slow or minimize the
     copper-tin intermetallic growth.  If I simply bake a board for a long
     time, the copper-tin intermetallic grows faster and can become
     problematic for soldering.  I'd question how much shelf life I'm
     buying by reducing the storage temp from 25C to 14C.

     One man's opinion.


______________________________ Reply Separator _________________________________
Subject: [TN] Storing PCB's
Author:  "TechNet E-Mail Forum." <[log in to unmask]> at smtp
Date:    5/14/98 11:53 PM


I am confused.

For years, I have understood that the best way to store pcb's prior to
assembly is in a heated, relatively dry environment.  I am sure that the
general consensus amongst most manufactureres is that this works best.

Well, just recently I was told by a company setting up a new facility that
they had been advised by a well known consultant to use a cold dry
environment.  They are planning a 12-14 degree Celsius storeroom, once again
relatively dry.

Is there new thinking on this, or have they been badly advised?




[Nicholas Kane]
[Axion Australasia]
[Suite 3, 651 Canterbury Road]
[Surrey Hills]
[Victoria 3127 Australia]
[tel: 613 9899 3511    fax: 613 9899 3811]

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