Guenter Your information is not accurate for all VP systems. Note that the term Condensation Soldering (CS) also applies. Our system, for SAC alloy melting at 218 DegC uses a 230 DegC boiling point fluid. The actual temperature delta over melting / eutectic is less than 5 DegC. In conventional convection ovens, the temp delta may well be 30 to 50DegC over melting/eutectic, and this might explain the 270 DegC comment. There are fluids with a 270 DegC boiling point, but they should not be required in this process. With a VP or CS type system, the vapour simply condenses onto all surfaces that are colder than it, thus it is fast but controllable. Regards Graham Naisbitt [log in to unmask] <mailto:[log in to unmask]> Concoat Limited Alasan House, Albany Park Camberley GU16 7PH - UK www.concoat.co.uk <http://www.concoat.co.uk> Phone: +44 1276 691100 Fax: +44 1276 691227 Mobile: +44 79 6858 2121 > -----Original Message----- > From: TechNet [mailto:[log in to unmask]]On Behalf Of Guenter Grossmann > Sent: 14 February 2002 16:44 > To: [log in to unmask] > Subject: [TN] Antw: [TN] Vapor Phase Soldering ReVisited! > > > Jim > > I believe the VP is still a good principle. However, the > industrial partner in LEADFREE that runs the VP trials told me > that he has to use a liquid with a boiling point of 270 deg.C and > that there is nothing available that boils around 230 deg. > I had problem to believe this but also after asking again I got > the same answer. > > Best regards > > Guenter > > . > > EMPA > Swiss Federal Institute for Materials Testing and Research > Centre for Reliability > Dipl. Eng. Guenter Grossmann > > 8600 Duebendorf > Switzerland > > Phone: xx41 1 823 4279 > Fax : xx41 1823 4054 > mail: [log in to unmask] > > ------------------------------------------------------------------ > --------------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > 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 delivery of Technet send e-mail to > [log in to unmask]: SET Technet NOMAIL > To receive ONE mailing per day of all the posts: send e-mail to > [log in to unmask]: SET Technet Digest > Search previous postings at: www.ipc.org > On-Line Resources & > Databases > E-mail 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 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------------