Currently the parts being cleaned are mechanical assemblies that are inside the HV oil chamber.  It has not been used for oil covered circuit boards... yet.  The "dirty" parts would have dielectric oil and possibly some "soot" from arcing.

-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: Thursday, June 10, 2004 9:33 AM
To: TechNet E-Mail Forum.; Phil Nutting
Subject: Re: [TN] Cleaning fluid and ionic contamination


What is the nature of the parts and what contaminants would you expect 
to see on them? Naphtha is a good degreaser, but it's useless for ionic 
contaminants, flux residues etc.

Brian

Phil Nutting wrote:

> Good morning Technetters,
> 
> We now have a Safety-Kleen system which is being used for cleaning some parts that ultimately go into dielectric oil in a high voltage system.  The solvent used is "Safety-Kleen Premium Solvent" which is basically Naphtha.  The system filters and re-distills the solvent to keep it "clean".
> 
> My question is, once a part has been washed and dried, just how clean is it?  It may be grease free, but how much invisible crud may be lurking on the part that once installed into a high voltage system can cause high voltage breakdown either short term or long term?
> 
> How can we profile the relative cleanliness of the parts?
> 
> Thanks in advance for your guidance.
> 
> Phil Nutting
> 
>  
> 
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