[Elecraft] KSYN3A mod problem

[Fred Townsend]

Gentlemen: 
Water is not a problem. You want the water to pick up the water because
alcohol is a non-polar solvent meaning it does not pick up the ionic
contamination. The water picks up the ions and alcohol picks up the water.
Conclusion rubbing alcohol containing water works just fine although the
50/50 cheap stuff now sold is not as good as the 70/30 or 91/09. Best way to
clean is to blot and or air squeegee the liquid off. Don't let it evaporate.
That leaves the sold residues behind. When finished cleaning if you still
have worries about water then bake out your board at 90 to 95 degrees C. 30
minutes is all that is needed.

73,
Fred, AE6QL

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
ae4pb at carolinaheli.com
Sent: Tuesday, September 8, 2015 6:15 AM
To: 'Ian White'; elecraft at mailman.qth.net
Subject: Re: [Elecraft] KSYN3A mod problem

When you purchase alcohol to use as cleanup it's best to get the highest
concentration you can get, else, there is a risk of it leaving a residue and
the evaporation rate is much slower. Most drug stores sell 91% or higher if
you ask/look for it. 60% is more common. Higher % is better for cleaning and
evaporates more cleanly.
Jer


-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ian
White
Sent: Tuesday, September 08, 2015 4:09 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KSYN3A mod problem

>Don:
>Acetone should NEVER be used in electronic assembles. Acetone causes 
>both long and short term effects on various components including the 
>PCB. It effects epoxy, lacquers, paints, and plastics, particularly 
>polystyrenes
[...]
>73, Fred, AE6QL

Chemicals intended for use around electronic components, including PC
boards, have been formulated according to an industry-wide "Non Aggression
Agreement". This aims to ensure that chemicals such as flux cleaners and
contact cleaners will not damage the plastics that are used in the majority
of components. In return, component manufacturers try to avoid using
plastics that would be damaged by solvents in common use. 

Undiluted acetone is not part of that agreement because it's simply too
aggressive, as Fred describes. 

Although electronics-grade solvents are more expensive than bulk commodity
solvents like acetone, for peace of mind they are worth the extra cost.


73 from Ian GM3SEK


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