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Subject:
From:
Jean-François Bissonnette <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jean-François Bissonnette <[log in to unmask]>
Date:
Tue, 16 Mar 2010 13:22:38 -0400
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@Douglas

We have many clients all with different applications.  The purpose of my question is more for information than anything else.  We have to give a minimal training to our employees and I'm the lucky one who has to prepare that training!  So all the information I can get, including pics, is more than welcome.

Thanks!

@Angel

We do as well but from our experience, I'd tell you the same thing you see in those "miraculous get-slim machine" they sell on TV.... "RESULTS WILL MAY VARY".  When we use silicone based coatings, we usually have no adhesion problems.  The same cannot be said about acrylic coatings with which we've sometimes saw dewetting problems.


Jean-François Bissonnette
Technologue - Documentation de procédés / Process Documentation
T | 450.967.7100 ext.242
E | [log in to unmask]
W | www.digico.cc

N'imprimer que si nécessaire - Print only if you must


-----Message d'origine-----
De : Douglas Pauls [mailto:[log in to unmask]] 
Envoyé : 16 mars 2010 12:57
À : [log in to unmask]
Objet : Re: [TN] Conformal Coatings: Resistance to Humidity and Moisture

Yes, we do this, but again, we know our residues very very well and have 
studied the compatibility of the flux residues with the coatings we use. 
It can be done, done reliably, and with decent adhesion of coating to flux 
residue. 

Doug Pauls



"Reyes, Angel LAM2 4429" <[log in to unmask]> 
03/16/2010 11:39 AM

To
"TechNet E-Mail Forum" <[log in to unmask]>, <[log in to unmask]>
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Subject
RE: [TN] Conformal Coatings: Resistance to Humidity and Moisture






Doug

This is a different question, but related with the same thing, is anyone 
have experience with CC applied on top of no clean flux

Regards,
Angel Reyes



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Tuesday, March 16, 2010 9:15 AM
To: [log in to unmask]
Subject: Re: [TN] Conformal Coatings: Resistance to Humidity and Moisture

We use silicone conformal coatings for some of our products.  The most 
common applications for the silicones is when you have liquid water 
running across the assembly.  Applications like our weather radar, which 
is in the nose cone of the plane and it rains inside the nose cone as you 
come down from the cold.  Other places it has been used when the assembly 
is likely to sit in liquid water, such as the bottom side of a 
motherboard.  Against liquid water, it is superior.  Against water vapor, 
not so much.  They also have a tendency to be very porous to sulfur 
compounds, which is very important if you are using any silver.  Like any 
other material, it has its positives and negatives and you have to weigh 
them with respect to the design life of the product, the end use 
environment, and the consequences of failure.  Dow Corning has a good 
knowledge base on its web site (www.dowcorning.com) that I often use.

What is your end use application?

Doug Pauls
Rockwell Collins



Jean-François Bissonnette <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
03/16/2010 10:44 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Jean-François Bissonnette              <[log in to unmask]>


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[TN] Conformal Coatings: Resistance to Humidity and Moisture






Hello Technetters,

 

I'm preparing a informative document on conformal coatings so I did some 
searching around the Net.  There seems to be diverging opinions on the 
pros and cons for Silicone coatings.  Some places that they have a good 
moisture/humidity resistance, some other say that they are not the best 
for moisture resistance.  Anyone with hands on experience can share a bit 
of knowledge on that matter?

 

Thanks!

 

JF

 


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