I agree with the others. We have a big ultrasonic cleaner for cleaning ceramic substrates and we use alcohol. The machine is a monster with all security arrangements, such as over dimensioned vapour exhaust system, sensors for ionized air warning, a lot of ESD fixes, massive steel doors etc. The alcohol tank is separated from the machine in an other room and on top of that a gigantic fire distinguish system. So, flammables and ultrasonic is not to recommend without consulting specialists. Don't forget that some of these cleaning liquids can ignite if the pouring height is three feet or so. We had an accident many years ago that underlines what I say. A guy worked late in the night. Among other things he was doing, he filled some kind of cleaning agent in a small container for hand cleaning electronic parts. Suddenly there was an ignition and then things went on in a speed that the guy could not handle.  The fire that followed caused construction aluminum bars in the ceiling to melt and drop to the floor. Instruments for million dollars were destroyed. The repair cost was a eight digit sum. Today, we have lots of restrictions using flammables. Refill containers (bottles)for bench working must not be larger than 2 liters and are detonation safe, to mention one example.
/Inge 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Anselmo
Sent: måndag 29 juni 2009 17:27
To: [log in to unmask]
Subject: [TN] IPA o r Methanol in Ultrasonic Cleaner

Technet,

We are being asked by one of our customers to clean some parts (screws, washers, standoffs, feedthrus) in an ultrasonic cleaner with either Methanol or IPA (spectroscopic grade).
The time in the ultrasonics could be up to 1 hour.
Does anyone else have experience and recommendations for doing this?
My main concern is safety.  What type of room or enclosure do we need for this?

Thanks,
John Anselmo

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