Hi Genny,
I am not a chemical guy either, but I know that the IPC-7711/7721
specifications do not specify materials or even desirable properties of
materials to be used, so it is left to the user to decide. One resource I
can offer is a company I know that specializes in rework / repair. They
offer rework and repair turnkey services, training, and also material kits
to be used for such repairs. I bet they have Data Sheets on the properties
of the materials they sell.
http://www.circuitmedic.com/index.shtml
http://www.circuitmedic.com/products/base_board.shtml
It looks like their epoxy kit is 2-part, but comes in pre-measured packets.
It may be worth a call to pick someones brain about a one part material.
Anyway, I hope that helps. Spring is coming.
Kevin Glidden
Manufacturing Engineer
Luminescent Systems Inc.
-----Original Message-----
From: Genny Gibbard [mailto:[log in to unmask]]
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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