It is a little bit difficult to see the exact problem, but I think it can be attributed to one of two possible causes.  There may have been some contaminant between the laminator and the top of the mask when the mask was applied or the board was hot and the mask stuck to those spots when it was placed across the board.

I would not think the dielectric strength was compromised.  It is probably just cosmetic.

Chuck Brummer
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Mike Sewell wrote:

I've included a link to my driveway pictures folder below...

http://www.driveway.com/share?sid=cf31acf7.c3168&name=Pictures&view=3

dryfilmwrinkles.jpg - note the arrows

We received these boards and noted substantial wrinkling in the dry film
mask.  While they meet IPC-600F in that the wrinkles do not violate minimum
electrical spacing or fail the tape test for adhesion, I'd appreciate any
comments from the rest of you as to possible causes, reliability issues,
...etc.

TIA,
Mike Sewell

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