Alan B. Pearce <A.B.Pearce <at> rl.ac.uk> writes:
> That is what I get in current ESA equivalent inspection courses. Flux is 
> required to be removed within 24 hours of soldering. 

I am not sure what the 'space' grade work is supposed to look like. I know that 
many (most) boards for special environments need some kind of conformals coating.

Ime, ancient, cheap valve radios from the 1940s and 1950s which use solder 
mask-less printed (cardboard phenolic) circuit boards often use just a layer of 
rosin based flux as the only thing between them and oxidation. And it works. 
After 50-60 years, the only few places where corrosion got at them is where the
layer flaked off or lifted off (usually board edges etc).

Wikipedia knows about rosin:

  http://en.wikipedia.org/wiki/Rosin

and its main ingredient (so MSDSspeak for 'pine odor' is 'irritant' ? What's the 
MSDSspeak for dihydrogen monoxide again ?, the one with the drowning risk in case
of inhalation ?). One does not need a license yet for owning a piece of pine 
tree. But I think that they are working on its regulation already.

Peter P.


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