[sdiy] Which solder is safer for home projects ?

[Jason Proctor]

i must confess to using the Paul Schreiber method for soldering - i use
organic water washable flux for most board components and then regular
stuff for wiring and anything mechanical.

dumping the organic flux down the sink isn't particularly enviro friendly,
for sure. however, i do find the populated boards very tidy and clean, and
easy to examine for issues.



On Fri, Oct 23, 2015 at 3:41 PM, Richie Burnett <
rburnett at richieburnett.co.uk> wrote:

> ---- Tom Wiltshire wrote ----
> >
> > Do I *really* *actually* need to worry about any of this stuff?
>
> The only time I've actually seen a problem that was traced back to poor
> flux cleaning was around a 32.768kHz watch crystal that had been manually
> replaced on a large batch of boards made for a company where I worked.  The
> real-time clocks in all of the product that was shipped to Asian markets
> started to fail in the humid season. Other world markets were unaffected.
> This was apparently due to flux residue absorbing water from the humid
> atmosphere, forming a conductive path with salts present in the flux and
> damping the crystal enough to stop oscillation.
>
> This happened on hundreds of boards, so it is a real phenomenon, and the
> ensuing recall and rework was very costly for the company.
>
> High impedance nodes are most susceptible to stay leakage paths, like the
> low-power watch crystal in this example, or something like an analogue
> sample and hold circuit.
>
> -Richie,
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