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

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Concoat Limited
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> -----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]
>
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