Reagent grade

----- Original Message -----
From: Robert Kondner [mailto:[log in to unmask]]
Sent: Saturday, February 04, 2012 04:24 PM
To: [log in to unmask] <[log in to unmask]>
Subject: [TN] Is 99% USP IPA what most folks use?

Hi,

 

I was reading through the Ellis book on cleaning and I noticed adding IPA to
water reduces surface tension. 

 

Neat, I figure that is a simple way to improve a rinse. I was planning on
final rinse with distilled water so I don't need to bother with blow off as
much.

 

Just for fun I looked into various grades and it looks like dissolved
materials is about .005% or 39mg / Liter. (1 L = 780gram)

 

Hmmmm, That sounds rather high compared to distilled water. I mean Lake
Michigan is 170 mg/L I think.

    (See:
http://www.aquapurefilters.com/contaminants/163/total-dissolved-solids.html)

 

No one would think twice about dipping a cleaning swap into IPA to clean a
board. But Lake Michigan water? Holy Cow!

 

Did I find the wrong specs on the IPA?

 

Bob K.

 



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