I had that in 1970 while doing R&D in the Plastics industry. Very much like having a bad case of Malaria. It was a very humbling experience, such that I would never get stuck on myself.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of P. Langeveld
Sent: Tuesday, February 03, 2009 3:08 AM
To: [log in to unmask]
Subject: Re: [TN] Vapor Phase Soldering
Hi All,
I followed the discussion with great interest. Especally the time that
PFC's could reach the region where they could possible depleted.
To prevent that chance by 'burn' the vapour over 250dC in a torch is
not a good idea, because the PFC will decompose in a gas that can
cause 'Teflon Fever'. Thats why teflon may not be worked up in lathes
unless exhaust precautions.
Rehm has solved the problem of entrapped liquid after soldering by
using an in-line vacuum step in the process after reflow. There is a
drawback: the equipment costs a few dimes.
Peer Langeveld
Consultant Soft Soldering Processes
5502 VH 8
The Netherlands
2009/2/2 Hernefjord Ingemar <[log in to unmask]>:
> You are right, Louis.
> Aurora Borealis is seemingly a result of that kind of repulsion
> About UVA/UVB, how much is retarded by the O3, and what happens, are the photons reflected or absorbed or what happens? If you name the layer a filter, you might speak about a low/high/wide band pass filter. And filter efficiency.
> Inge
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Louis Hart
> Sent: måndag 2 februari 2009 15:20
> To: [log in to unmask]
> Subject: Re: [TN] Vapor Phase Soldering
>
> Inge, if my understanding is correct, ozone protects us from ultraviolet radiation, not cosmic radiation. The Earth's magnetic field deflects cosmic radiation from regions where people live.
>
> Incidentally, not long ago I read something about cosmic rays and their energies. I do not know what statistical distribution their energies follow, but one detected particle, an extreme case, had as much energy as a tennis ball as served.
>
> Louis Hart
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
> Sent: Monday, February 02, 2009 3:23 AM
> To: [log in to unmask]
> Subject: Re: [TN] Vapor Phase Soldering
>
> sorry, I hit the 'send' before I was ready. Furthermore, I'm fascinated by all the matters about the atmosphere. Obviously, our existence is much dependent of what happens up there. However, I don't use to accept everything without a little sceptical reflexion, and so is the case even here, namely, the famous ozone layer. All this investigation and writing and fear...are we sure about the role ozone plays, I mean, is the thickness, variation and existence of the ozone layer really that critical? Ozone alone can't be the only catcher of cosmic radiation, can it? How can this tiny layer of O3 molecules retard or even stop the enormous velocity of those space particles? Well, you can see how ignorant I am. But as such, I also am willing to learn.
> Thank you for taking you precious time to give answer.
>
> Inge
>
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