Hi Steve!

Kapton tape to hold it temporarily in place during assembly, then after
it is formed into final position, very carefully remove the kapton and
put some of that conformal coat you've got on it.

By the way, isn't that coating kind of thick?  I recall a discussion
about that on TechNet a few months ago wherein the thick conformal coat
appeared responsible for wrecking a CERDIP (not that I see any of those
in the picture).

Wayne Thayer



>>> [log in to unmask]  >>>
Hi All!
 
I got a rigid-flex assembly here that has multi-layer flex in it, and it
had a layer of the flex get torn while de-masking it after conformal
coating. I have a picture of the tear here:
 
http://www.stevezeva.homestead.com/files/Flex_Tear.jpg
 
As you see, the tear is on the edge and away from any conductors. The
assembly isn't going to be continuously flexed back and forth, it is
going to be formed in a fixture and remain that way and installed into
the upper-level assembly where it will stay in the formed position.
 
Should I do anything with it other than maybe carefully trim it off?
Will any repair actually do anything as far as reliability is concerned?
For that matter, has the tear compromised the reliability of the flex in
that area? There's been suggestions of some sort of epoxy repair, but I
don't think that it will buy you anything as far as reliability is
concerned.
 
What do you think I should do?
 
Steve Gregory

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