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Dave:
I have used Nitrogen in certain situations to provide an inert
atmosphere for the solder paste if I had to leave the paste for a
period of time longer than normal after printing. It was done with
the intent of minimizing the oxidation of the solder spheres if there
was significant solvent (carrying agent) losses. I seemed to have
excellent luck but I was using an RMA solder paste.
A suggested vendor of nitrogen desiccator boxes is Terra Universal
and their number is 714-526-0100.
I would recommend that you touch base with your solder paste vendor
and see what they might recommend. Some formulations of solder paste
are more susceptible to process problems than others especially if
your facility is not temperature and humidity controlled. They may
have a formulation that may work for your exposure time.
Kevin Frasier
[log in to unmask]
http://www.sciatl.com
______________________________ Reply Separator _________________________________
Subject: Assembly: Solder Paste Life Extension
Author: [log in to unmask] at PMDF
Date: 4/16/96 12:59 PM
Hello TechNet - I am looking for some opinions/info on the use of
extending the tack life of printed solder paste on assemblies. Yes, I
know I should be processing as soon as possible but life on the
process floor is far from ideal!
1- Does storage in nitrogen chambers help?
2- Who manufactures nitrogen chambers?
3- Does refrigerated storage help?
4- Any technical papers/resources available in industry?
Thanks,
Dave Hillman
Rockwell Collins
319-395-1615
[log in to unmask]
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Subject: Assembly: Solder Paste Life Extension
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