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] --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------