Craig

VP reflow has a severe disadvantage: the Fluorinert or Galden or
whatever, are amongst the world's worst global warmers, with a GWP of
about 10,000 and an atmospheric residence time of about 10,000 years.
This means that they leave a terrible legacy for the next 25 generations
or so. They are also targeted in the Kyoto Protocol for the same reason.
This means in rough figures that 2 kg of the stuff is equivalent to all
the CO2 a medium sized car (~2.5 litre engine) will produce during its
whole lifetime. The process is still used a large extent in Europe.

Perfluorocarbons should be used ONLY where there is absolutely no other
choice and under the maximum non-emissivity, in my opinion.

Brian

Craig Hillman wrote:
>
> Werner brings up an interesting point. Does anyone have an opinion on the
> trends in solder reflow in the contract assembly industry? Are we seeing a
> resurgence in vapor phase? Has flowing nitrogen during infrared fallen to
> the wayside? Interested in seeing your responses.
>
> Best Regards,
> Craig
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Werner Engelmaier
> Sent: Thursday, May 31, 2001 1:19 PM
> To: [log in to unmask]
> Subject: Re: [TN] AW: [TN] Pad in Via for BGA's - Part II
>
> Hi Rush,
> Vapor phase soldering was and is thew most elegant engineering solution to
> soldering--no over-temperatures, no profiles, absolute temperature
> uniformity. What killed this approach in the past was inadequate
> equipment--thhis is no loger a problem.
>
> Werner Engelmaier
>
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