Earl-

        It is a privelage to offer anything I can to someone who has always helped
me.  I appreciate the help I received from all when I first installed the
spray fluxer we are using, which is when we switched to no-clean.  (Was that
here or over at SMTnet?)
        We have IR pre-heaters (barbaric these days, I know) and I did have to
elevate the pre-heater temp. to properly heat the boards before the wave.
The profile is still ramping at an acceptable rate to protect the caps, but
the pre-heat settings were one of the initial hurdles.
        I am more interested in changing to convection pre-heaters before I look at
inert.  As was mentioned earlier the flux we are using is designed for air
atmosphere and seems to work well in it.  For now I'll have to leave inert
for those with the big bucks :)Convection pre-heaters would give me finer
control over the ramp and more even heating.  I remember earlier Technet
postings about self-installed convection tubing using drilled pipe.  Has
anybody succesfully installed this and seen improved results?

Ryan Jennens

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of [log in to unmask]
> Sent: Wednesday, January 06, 1999 10:02 AM
> To: [log in to unmask]
> Subject: [TN] Water contents in no clean flux
>
>
> Ryan,
>
> Always a pleasure to see from you. Glad for your VOC success. We
> all need what you have.
>
> I'm glad you increased your wave temperature. Did you increase
> your preheat to compensate? So many
> people are concerned about ceramic chip device cracking (as they
> should be while being equally
> concerned about thermally shocking PCB's), they crank down the
> wave temp hoping to avoid the problem
> without enough concern for solder joint quality and reliability.
>
> It certainly is a balancing act but, as you say, it only is
> getting better through chemistry. You do
> realize DuPont used to have a slogan stating "BETTER THINGS FOR
> BETTER LIVING THROUGH CHEMISTRY."
> This, of course, was pre-serious drug era verbage.
>
> When are you going inert?
>
> Serious regards,
>
> Earl Moon
>
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