An interesting suggestion, but one that needs a little care in implementation. This may well introduce another problem - condensation on to the board and onto then into the paste on exit from the fridge. The boards should be covered on placing in fridge and not uncovered till they are at ambient if this is done. Kind Regards Mike Fenner Applications Engineer, European Operations Indium Corporation T: + 44 1908 580 400 M: + 44 7810 526 317 F: + 44 1908 580 411 E: [log in to unmask] W: www.indium.com Leadfree: www.Pb-Free.com -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Dan R. Johnson Sent: Wednesday, July 31, 2002 5:09 PM To: [log in to unmask] Subject: Re: [TN] Paste sit time Michael, I agree with the comments that it depends on the paste. I would add another option. You can extend the working life of printed paste by keeping the pasted PCB in a refrigerator, this slows the evaporation of volatiles. Again consult your paste vendor. I have held units overnight this way during prototyping and still had good re-flow, wouldn't go that long in production though. The best option would be changing to a past with a long working time. BTW will management let you spend some of the money saved on other equipment? Could soften the blow of compromising the ideal line set-up ;) Dan ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free 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/html/forum.htm for additional information, or 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 1.8e 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------