We used Silane A174 for adhesion promotion of parylene - expensive but
only 4 ml consumed per run since it was vacuum deposited in chamber (18"
dia. x 24" height).  

Mike

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Wednesday, June 17, 2009 6:52 AM
To: [log in to unmask]
Subject: Re: [TN] Conformal Coat and Solder Coated Outer Layers

I would agree with Rich.  I have found that a 5-10% solution (in 
isopropanol) Dow Corning Z-6040 organosilane primer is effective at 
improving adhesion between between some acyrlics and the substrate, but 
that is also a function of the surface energy.  But the stuff is God
Awful 
Expensive.  Some of the other primers we tried, like the Dow Corning
1200 
or 1204, used primarily with silicone adhesives, caused a great deal of 
dewetting of the coating. 

However, three passes of the coating through an in-line alkaline water 
wash is asking a lot of an acrylic.  We don't let Humiseal 1B31 go
through 
our in-line saponified wash.  Does nasty things to the coating.  A 
urethane might be able to, but not an acrylic.  At least a pure acrylic.

Doug Pauls
Rockwell Collins



Richard Kraszewski <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
06/16/2009 10:00 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Richard Kraszewski <[log in to unmask]>


To
[log in to unmask]
cc

Subject
Re: [TN] Conformal Coat and Solder Coated Outer Layers






Dow Corning makes some siloxane compounds that acted well as primers for
epoxy based compounds.  They may have some that work well with AR and/or
UR CC's.

Suggest you contact them. 


Rich Kraszewski / PLEXUS 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Doug Schueller
Sent: Tuesday, June 16, 2009 8:29 AM
To: [log in to unmask]
Subject: [TN] Conformal Coat and Solder Coated Outer Layers

To all:

Any ideas on treatments that can be applied to the solder coated outer
layer of a PB to enhance adhesion of UR or AR conformal coating? The
outer layer is a solid ground plane with reflowed tin/lead solder. The
coated assembly needs to be able to withstand multiple (3 or so) passes
through an in-line cleaner using alkaline wash chemistry. Any mechanical
treatments or coating application tips would also be appreciated.

Thanks in advance.

Douglas Schueller
Technology Support and Development Manager IPC-Certified EMS Program
Manager AbelConn, LLC
763-536-3612
[log in to unmask]
www.abelconn.com


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