Homebrew PCBs

Stefan Trethan:

I just rechecked the new bottle of iso that I recently purchased from 
Safeway supermarket,
and it is 99% iso alcohol,  not 90% as I might have stated previously.

Honestly,  I don't think that for the purpose of cleaning off home-made 
printed circuit boards,
the character and integrity of the iso alcohol that one uses is of any 
great significance insofar
as purity is concerned. If one is doing work for NASA or some Hi-Rel 
defense system, then
doing the analysis might be important. And even in those cases the 
vendor of the material would
most likely supply you with those types of quality data.

Better to spend that time making good, clean PC layouts
for your projects.

Besides who has all that lab equipment, and who wants to work to the 
degree of cleanliness
required to make the measurements meaningful??

This stuff is supposed to be fun!

Just my opinion.

Roland F. Harriston
**************
> On Mon, 27 Nov 2006 20:10:53 +0100, Bert <bertd.geo@...> wrote:
>
>   
>> I get 91% for cheap at either target or WalMart and it owrks for most
>> general purpose applications. No good for things like video heads and
>> other sensitive applications though.
>> I used to always get 99% at the local Snyders Drug store for still a
>> reasonable price (few bucks for a pint). I haven't checked recently
>> (still have quite a lot on hand) but I think they still sell it. If
>> it's not on the shelf, ask at the pharmacy counter. I'm sure they can
>> order it and Snyders has always been easy to work with.
>>     
>
>
> I was wondering, can one accurately measure the purity of IPA or ethanol  
> by measuring the density?
> Like measuring volume and weight, or using a hydrometer?
> I recently found a 0-100% ethanol hydrometer, but i'm wondering if the  
> measurement would tell me much, what if the other ingredients are not  
> water? What if they have a density other than 1kg/l, then the measurement  
> would not tell me the purity?
>
>   




> ST
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