[Elecraft] [POSSIBLE SPAM] Cleaning Solder Flux, Redux

[Harlan Sherriff]

I supervised a Metrology lab at a commercial nuclear power plant for 34 years. We also performed component level repair to “safety related” equipment. We used isopropanol applied with a stiff “acid” brush (cut the bristles short). Never had a problem with NRC audits. 
That being said, if you ever work on a board that is humidity sealed (plastic type coating on solder side), be very careful as the alcohol will loosen the coating and it will do a number on unsealed potentiometers and switches!

Harlan 
K4HES

Sent from my iPhone

> On Dec 31, 2021, at 4:38 PM, Dr. William J. Schmidt <bill at wjschmidt.com> wrote:
> 
> Professionals use 91% Isopropanol.  You can get it at CVS cheap.
> 
> 
> Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
> VP2EHZ
> 
> 
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
> Behalf Of edauer at aya.yale.edu
> Sent: Friday, December 31, 2021 2:53 PM
> To: elecraft at mailman.qth.net
> Subject: [POSSIBLE SPAM] [Elecraft] Cleaning Solder Flux, Redux
> 
> 
> 
> Is there a consensus among builders of the traditional kits (K1, K2, etc)
> about the best way to remove solder flux from a completed circuit board?
> Some Internet sites recommend acetone, others say isopropyl alcohol. A few
> tout their own product without saying exactly what it is.  I remember
> reading someplace that one or the other of those will clean the flux but
> could also cause damage by being absorbed into components.  Yes, I know this
> is all purely cosmetic but if it can be done safely I'd like to try it on
> the next kit.  Suggestions?
> 
> 
> 
> Thanks,
> 
> 
> 
> Ted, KN1CBR
> 
> 
> 
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