I wonder if the ramp to reflow would be too fast for some the the packages we use today. Some BGA packages will warp if ramp rates exceed 1?C per second. > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of > Jason W. Gregory > Sent: Wednesday, July 02, 2003 9:26 AM > To: [log in to unmask] > Subject: Re: [TN] Double-sided reflow with Altera RQFP... > > > Bill, > > I encountered vapor phase in a former life and although I > have never used step soldering, found vapor phase to be > unequalled in thermal distribution. The only downside is cost > of media (fluid) and some on this forum have spoken of > possible health and ozone concerns in regards to fluorinated > fluids. We used Galden and 3M fluid and it wasn't cheap. > Results were excellent. > > > > Jason Gregory > SMT Production Supervisor/ > Integrated Product Team Leader > LaBarge Inc. > (918)459-2367 > (918)459-2221 fax > [log in to unmask] > http://www.labarge.com > > > > [log in to unmask] > Sent by: TechNet To: > [log in to unmask] > <TechNet@listserv cc: > .ipc.org> Subject: Re: > [TN] Double-sided reflow with Altera RQFP... > > > 07/02/2003 07:19 > AM > Please respond to > "TechNet E-Mail > Forum."; Please > respond to > Wgkenyon2 > > > > > > > A historical note: What ever happened to step soldering using > different vapor phase fluids of precise boiling points? As I > recall there was a paper on this by NT (?) about such a > process run very successfully at their West Palm Beach > facility at one of the NEPCON technical proceedings some > years ago. Proper selection of the alloys used and the > K-Fluids (which boiled about 30 degrees apart, as I recall) > allowed this step soldering to be done with ease. In some > cases, mixed K-Fluids were used to 'tailor' the vapor phase > to the alloys in use. The entire range went from K-6 (typical > for eutectic > tin-lead) up > to K-10, which could melt pure tin. > > Bill Kenyon > Global Centre Consulting > P.O. Box 553, Montchanin, DE 19710 USA > Tel: 302.652.4272 Fax: 302.652.5701 Cell: 302.377.4272 > email: [log in to unmask] > > --------------------------------------------------- > 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 > ----------------------------------------------------- > --------------------------------------------------- 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 -----------------------------------------------------