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July 2007

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TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
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Thu, 12 Jul 2007 14:09:31 EDT
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In a message dated 7/11/2007 4:18:48 PM Eastern Daylight Time,  
[log in to unmask] writes:

I'm  looking for comments from those who have any experience in attempting 
to  apply conformal coatings to a hot assembly. By hot I would say equal to 
or  less than the recommended cure temperature for the particular coating. 
I'd  be interested in any positives or negatives to having a hot assembly 
while  applying the coating. Thanks.

=========
 
It depends on the type of coating and the type of coating  process.  A 
solvent based coating will tend to flash off faster and  "freeze" in place in a 
spray or selective type application.  This can be  good for very tight keep-out 
clearances and can be bad if you expect coating to  flow under devices, etc.  
Most silicone coatings will have the opposite  reaction.  The heat will reduce 
the viscosity and the coating will flow  further and wet better.
 
Jon Moore




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