Charles Caswell, From an ESD perspective, I believe that you are in good shape. You're using Nitrogen with a grounded tip to blow off alcohol. If you or you customer need confirmation, get a static meter, and see if you can generate a charge from the gun / tip when in use. My only concern is that I've used pressures up to 80 psi, but that's because the facilities I've worked in never had Nitrogen or Shop Air above 80 psi. At 100 psi, I would be more concerned about damaging the hardware with that amount of pressure. Having worked previously with space applications, if I was your customer, I would be more concerned about using just IPA to clean boards instead of using an aqueous cleaner. For spot cleaning, IPA works well, but for board cleaning using rosin based flux (I'm assuming that you're using rosin flux for space applications), I found that IPA may not be as great a cleaner as the customer may think. Most aqueous cleaners are better, from an ionic and non-ionic standpoint, than Freon based cleaners and IPA. Just my opinion. For an experiment, build some "flight quality" hardware, clean a few boards with just IPA, and a few with the aqueous cleaner. Test the boards via Ionic Chromatography and see if the IPA cleaned boards are as "dirty" as the aqueous cleaned boards; what level of and types of contamination both boards are at. Good Luck Lee Whiteman Senior Manufacturing Engineer ACI / EMPF Telephone: (610) 362-1200; Ext. 208 FAX: (610) 362-1290 E-Mail: [log in to unmask] <mailto:[log in to unmask]> > -----Original Message----- > From: TechNet [mailto:[log in to unmask]]On Behalf Of [log in to unmask] > Sent: Monday, August 28, 2000 10:41 AM > To: [log in to unmask] > Subject: [TN] Another ESD question > > > How do you folks feel about using compressed nitrogen to dry > printed circuit > boards? One of our customers will not allow aqueous cleaning of > their hardware. > As a result we clean all of their hardware in alcohol and dry by > blowing it off > with compressed nitrogen with the regulator at about 100 PSI. The > nozzle is > grounded at the tip. Please note that this is not related to my > earlier quetion > as this is done in a different area and only used on our space > flight hardware. > Thanks again, > Charles Caswell > > ############################################################## > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > ############################################################## > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in > the body: > To subscribe: SUBSCRIBE TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > additional > information. > If you need assistance - contact Keach Sasamori at [log in to unmask] or > 847-509-9700 ext.5315 > ############################################################## > ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################