Hi Doug,
I have been able to do this on SMT and wave soldered boards but not hand soldered boards. Have you been successful coating over no-clean hand soldered assemblies?
Thanks,
Jerry Dengler
Production Manager
Pergamon Corporation
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Tuesday, March 16, 2010 12:57 PM
To: [log in to unmask]
Subject: 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
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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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