Dave,
We don't use nitrogen in our reflow ovens at all, but I recall a paper from NPL and I think one from Air Products where they showed what levels made a difference.  I think they gave their numbers in terms of ppm instead of percent.
regards,
Bev Christian
Research in Motion

-----Original Message-----
From: Dave Hillman [mailto:[log in to unmask]]
Sent: March 9, 2004 1:00 PM
To: [log in to unmask]
Subject: [TN] Nitrogen Purity Question/Survey


Hi folks! Question for those folks using nitrogen for an inert atmosphere
in their reflow processes or as a blanket gas on their wave solder
processes. Cryogenic nitrogen is typically 99.998% purity (in terms of O2
content). On-site nitrogen generation equipment can deliver N2 gas ranging
from 99.5% to 99.99% purity (again, in terms of O2 content). What gas
purity level are you using in your processes and do you have a rationale
for selecting that purity level?  The reason for the question is that I am
involved in an exercise of comparing on-site nitrogen generation versus
cryogenic nitrogen supplies.

Thanks in advance for you assistance.

Dave Hillman
Rockwell Collins
[log in to unmask]

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