Phil:   Washing in DI water is a virtual "why bother" move.  If you have any sort of organic on the surface, DI is not going to touch it.
I would try an experiment where you did some more serious cleaning, perhaps manually, for the experiment, and see if this helps.
Rudy Sedlak
RD Chemical Company


--- On Fri, 5/23/08, Phil Nutting <[log in to unmask]> wrote:

> From: Phil Nutting <[log in to unmask]>
> Subject: [TN] Conformal coating washing off
> To: [log in to unmask]
> Date: Friday, May 23, 2008, 1:32 PM
> We are using Chemtronics Konform AR on some circuit boards. 
> The boards are batch washed in DI water and pre-baked prior
> to coating and then cured in a 60° or 77° C oven.
> 
> In a recent test of a new washing system where we are
> removing slip ring dust (brass and carbon) on these boards
> and dielectric oil from other boards and aluminum castings,
> I noticed the conformal coating peeling off in sheets after
> both the wash and DI rinse cycles.  Both wash and rinse are
> between 140 and 150° F.
> 
> Is this stuff peeling off because of the water temperature,
> poor pre-coating prep or possibly something else?
> 
> Thanks in advance,
> 
> Phil
> 
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