Solder mask epoxy should not be used for repairs of the underlying
substrate (FR-4 weave). Solder mask epoxy should only be used for rework
of solder mask. Note that epoxy coating/filling of exposed FR-4 is
classified as a REPAIR, and solder mask touchup is a REWORK, per IPC
7711/7721. To do one you do not need customer approval, to do the other,
you do. You need to be aware of this and know what your contract
requirements are, if there are any. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of ??
Sent: Monday, March 09, 2009 7:17 AM
To: [log in to unmask]
Subject: Re: [TN] Coatings, epoxies, etc crash course

Just ask your PCB supplier for the green oil(solder mask), that will be
enough for your prupose.

Hope this will do.

B.R.
Li Yi

----- Original Message -----
From: "Stadem, Richard D." <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, March 09, 2009 8:01 PM
Subject: Re: [TN] Coatings, epoxies, etc crash course


Not a good choice. It will fall off eventually, after the blooming. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Friday, March 06, 2009 10:43 AM
To: [log in to unmask]
Subject: Re: [TN] Coatings, epoxies, etc crash course

Genny,

How about one of the cyanoacrylate (Crazy Glue) adhesives?  There are
some water thin wicking (Loctite 420) that would soak into the weave.

Just an idea.  I wonder what the experts will say.

Phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: Friday, March 06, 2009 11:35 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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