Jeff, it is not normal for a solder mask to flake off a board, even if it is
under cured. When under cured, the mask tends to be softer than normal
and would be unlikely to flake.

There could be a number of causes for this problem. In order to better
trouble shoot this problem, more information is needed. Is this a liquid
photoimageable mask? Is it a screen defined thermally cured mask? Is the
flaking over the laminate or metallic surfaces or both?

I would be happy to help further if you would like to contact me directly or
we could discuss it over technet.

Bob Metcalf
Morton Electronic Materials
714-730-8356
e-mail [log in to unmask]

>>> Jeff Hempton <[log in to unmask]> 09/30/98
09:40am >>>
     Fellow Technetters,
       On some of our bare boards before build, with normal board
handling,
     (before ANY processing has been done) we are noticing that the
solder
     mask is flaking off. This condition is no longer there after wave
     solder. Our impression is that the mask is not fully cured. Are there
     other things that could cause this (contamination)?
       Is there a test that we can perform on the bare boards to prove/test
     this?
     Any thoughts would be appreciated!!
      Thanx in advance, group!

     Jeff Hempton
     Sr. Mfg. Eng'r
     United Technologies Electronic Controls
     email: [log in to unmask]

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