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



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                      <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]

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