Richard,
I agree with you on the Eccobond and Resiweld having qualified them a
long time ago, but I am not aware of Armstrong C7. If you say it does a
bang-up job, I would be concerned since it's 3 levels higher than C4.
Seriously though does it pass for Aerospace work (outgassing, corrosion,
compatibility issues)? Let me know, as I don't want to appear as stuck
in the past.
Dewey 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Monday, March 09, 2009 5:01 AM
To: [log in to unmask]
Subject: Re: [TN] Coatings, epoxies, etc crash course

Armstrong C7 with Hardener "W".
Resiweld
Eccobond
These all work well for sealing board cuts or damaged FR-4, but I like
the Armstrong best. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: Friday, March 06, 2009 10:35 AM
To: [log in to unmask]
Subject: [TN] Coatings, epoxies, etc crash course

Hello all,
I do a lot of component and material sourcing, crossing, and spec'ing.
Probably the area I struggle with the most is the materials, like
epoxies for board repairs, or adhesives, or sealants, cleaners, etc
etc,...I did electrical engineering, not chemical.
Is there any good resource place to get a handle on when you want an
acrylic versus an epoxy, or silicone, or ... basic properties, what
environment they are needed for, etc.
A specific sourcing question I have right now - for challenging board
repairs we use specially trained operators in a rework cell that use a
2-part epoxy to repair FR4.  One product has a track cut, that usually
causes weave exposure, that happens on every board on the line to allow
for different configurations, and they want a way to protect it
adequately with a 1-part quick curing material without sending it to the
rework cell.  We've tried those conformal coat pens, and they can be
washed right off the board.  Any suggestions?

Genny 

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