Inge,
That's a surprise about acetone.  The CRC Handbook lists the surface
tension of acetone at 25C as 23.46 mN/m and 20.66 mN/m @ 50C.  There are
no other entries.

However, I am surprised that you are surprised with regards to H2O vs
CFCs.  I mean water is as close to a "non-destructive" universal solvent
we have and to get CFCs to work the industry was generally adding 5%
methanol etc., which was what was really doing most of the "work".

What is tenside?  Oh, I looked it up on Google, you are talking about
surfactants.  OK.
Bev
RIM

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
Sent: Thursday, August 23, 2007 4:50 AM
To: [log in to unmask]
Subject: [TN] U/S vs liquids vs temp vs cavity efficiensy

 
Hi all,
we have ultrasonic cleaned with hot Acetone for years, without knowing
that this liquid has its highest cavity efficiency at -40 Centigrades.
Nor did we realize, that freons are ineffective compared with water
(only 5%). Water with some detergent or tenside addition is seemingly
superiour to most solvents in terms of cavity efficiency.
We have observed, that our Acetone cleaning was not so effective, now we
know why. Of course, you can increase the transducer power, but not all
parts like that.

Just thought someone more liked to see the interesting chart. Asking
Steve to put it on his wall.

Inge

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