Hello,

At 20:45 2017-04-23, Daniel Schacht wrote:
>Have you noticed those little curls of resinous smoke that rises when=20
>you solder? Has it occurred to you that those breathable vapors contain=20
>organo-metallic compounds in which some are lead (Pb) based? I would=20
>think you would prefer to not breath these vaoprs and would switch to=20
>newer, lead free solders. The learning curve is very short. They are=20
>easy to use. Try them -- you'll like them. The melting temp is only a=20
>few degrees higher and the dwell time -- the time you must keep the iron=20
>tip on the solder joint -- is around three seconds longer. I think the=20
>joints are stronger, too.

Sorry, but the lead-free solder joints are NOT stronger, this has been
proven by many publications. The strongest and most reliable soldering
still remains the old Pb one.

The smoke is not Pb either, it is the flux, and also the lead-free flux
is toxic.

I appreciate your concern, but the matter is more serious than it seems,
and more well-thought as well. It's not a caprice or such, but a need,
thus I am not suprised that certain fields (like automotive or medical)
are RoHS exempt, I'm just trying to understand till which exent they are.

In certain automotive applications (e.g. offroad quads) vibrations are
very important, and thus the solder joints must be very reliable. Sure,
one can resin the PCB (that thus becomes non-repairable should it fail)
but the problem exists, is real and is serious.

Kind regards,
Mario



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