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October 2002

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 29 Oct 2002 19:13:09 +0200
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Why N2? You would get exactly the same effect with dry air. However, be
warned: if the air or nitrogen becomes humid, you will reach an
equilibrium state between the parts and the air or gas, not perfect
dryness. You will need several successive "rinses" of dry gas to achieve
low levels and probably storage in large volumes, compared with the
volume of the parts. The only advantage of N2 over air is if you wish to
avoid an oxygen reaction, such as oxidation of reactive metals, and this
has damn-all to do with moisture (well, almost :-) ).

Brian

Gregg Klawson wrote:
> Hello Technet,
>
> A question came up this morning as to whether nitrogen could be used as a
> drying agent for PWBs, components, etc.  I know nitrogen is used as a fill
> gas for dry boxes, bags and to provide a dry atmosphere for component
> testing.  I don't have a feel for the physics of using nitrogen to dry
> something out.  We have a situation where baking at high temperatures may
> not be practical but immersion in a nitrogen atmosphere is.  Any ideas,
> references would be appreciated.
>
> Thanks,
> Gregg
>
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