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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Mon, 9 Mar 2009 12:02:36 -0500
Content-Type:
text/plain
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text/plain (145 lines)
Go to your distributor's website. Sometimes it is a lot easier to get
the material specs and MSDS there. For example, I use Ellsworth's
website to get the product information if I cannot find it at the
vendor's site. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: Monday, March 09, 2009 11:19 AM
To: [log in to unmask]
Subject: Re: [TN] Coatings, epoxies, etc crash course

We use that Armstrong material already.  Armstrong is from RTG (Resin
Technology Group).  I have had a great deal of difficulty finding out
any detailed information about RTG and Armstrong.  Resintechgroup.com
redirects to Henkelna.com.  I find Henkel's site to be fairly useless to
get any meaningful detailed technical information.
It is a 2-part epoxy.  For PCB repairs it works great.  But it is not
something that can be used for quick in-line touch-ups.

I am looking for a 1-part solution for quick touch-ups, that will hold
up.

I am also looking for general educational sources on electronic related
materials and chemicals.  Maybe that is a lot to ask, but how do you
know when to look for an epoxy?  When do you need an acrylic?  When
should you consider a silicone based material?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
(EHCOE)
Sent: March 9, 2009 10:03 AM
To: [log in to unmask]
Subject: Re: [TN] Coatings, epoxies, etc crash course

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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