[sdiy] cleaning flux

[Dave Manley]

I noticed we had 99% in the supply cabinet at work the other day.  
Here's a link: 

http://www.google.com/products?hl=en&safe=off&q=isopropyl+alcohol+99%

-Dave

David G. Dixon wrote:
> 100% isopropyl alcohol is difficult to manufacture, because of something
> called an "azeotrope" in the water-alcohol phase diagram.  This makes it
> impossible to produce higher than a certain purity of alcohol by
> distillation.  If one needs pure alcohol, one has to add pure alcohol to the
> refined (but slightly impure) alcohol to get the solution above the
> azeotrope.  This is expensive, so most alcohol is "azeotropic" or
> essentially at the azeotrope composition, which I'm presuming is about 93%
> for IA.
>
> At least, that's how I remember it from my chemical engineering classes at
> university lo those many years ago!
>
>   
>> I'd try a pharmacy first.  I don't think I've seen 100% isopropyl
>> available "over the counter" but my local drugstore has 93% or so,
>> which works fine for cleaning flux.  They tend to have distilled water
>> also (I recommend reverse osmosis). My preferred tool for getting
>> hard-to-remove flux out from between IC pins and such, is a small and
>> stiff natural-bristle brush of the sort commonly known as an "acid
>> brush."  I trimmed the bristles down very short (1/4" or so) to make
>> them as stiff as I wanted.  Here is a link to the type of brush I'm
>> describing:
>> http://www.parts-express.com/pe/showdetl.cfm?partnumber=360-368
>>     
>
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