Apart from the thread on this subject here a month or two back, the only
mention in literature that I know of is in my book, which discusses in a
diagrammatic form not only the effect of lotions before and after
soldering. Sanitisers didn't exist in those days, but their effect is
similar to lotions, although their oily components are lower.
As an addendum to my post in the earlier thread, I was back in hospital
for another operation last week and found that they had placed
squirt-bottles of sanitisers every 5 m along all the corridors,
presumably as an anti-H1N1 measure. This allowed me to have better
access to the stuff and I found that the hand was persistently
contaminated. I was able to repeat my mirror test 2 or 3 hours after
deliberately using the sanitiser correctly, being careful not to handle
anything in the meanwhile. As one of the components is a high molecular
weight polymerised glycol, it is a reasonable assumption that this is
the persistent substance. As it is hygroscopic, it is also a reasonable
assumption that it's not going to improve sensitive electronics if
transferred from the hand to an assembly. If such transfer occurs before
soldering, then the heat may cause further polymerisation, rendering the
hygroscopic residues more difficult, maybe impossible, to remove.
Brian
Diljit Matharu wrote:
> Can someone direct me to resources which talk about PCBAs contamination by the use of hand sanitizers & lotions.
>
>
>
> Thanks,
>
>
>
> Diljit S. Matharu
> Quality Leader - B C
> Creation Technologies
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