Solder Mask Delamination?

[Mythical Knights]

Not sure if this is the right place for this but here it goes.

 

We received some boards from the board-house with some various issues. One of which is possible delamination of the solder mask. Or at least that's what we think it is. I don't know what the IPC standard is for something like this partly because I'm not sure what it is and if it's bad or not. Our customer (whom this board will go to), is pretty picky about how their boards turn out. The simple thing we could do is just ask them if it's ok their boards have this but perhaps they don't know what it is and we would look pretty foolish if we asked them about it clueless ourselves. We are already in contact with the board-house on this matter.

 

Beyond making ourselves look foolish as it is not knowing what this is, I turn to the community.

 

Any ideas?

[mariushm]

Your question would be much better answered on EEVBlog : https://www.eevblog.com/forum/index.php

 

It's above my knowledge but if I were to guess ... the heating / curing of that layer wasn't done properly, maybe because you have a lot of copper fill under it, or uneven copper fills which absorbed heat or something like that.