Be sure it's not a scratch, caused by improper handling. If it's not a scratch, I bet it may be something I saw years and years back: tinned conductors under the solder mask. Sounds crazy, but we got repaired boards with that failure. Inge On 5 December 2012 17:49, Steve Gregory <[log in to unmask]>wrote: > Hi Mordechai, > > I have not seen anything like this before. I’ve posted your pictures so > everyone else can see: > > http://stevezeva.homestead.com/Pad_Wrinkle.jpg > > http://stevezeva.homestead.com/Via_Xsection.jpg > > Could you share what the overall stack-up of this board was supposed to be > and what prepreg thickness was used? > > Steve > > From: Mordechai Kirshenbaum > Sent: Tuesday, December 04, 2012 3:16 PM > To: [log in to unmask] > Subject: A PCB defect that is not specified by IPC > > > Hi Steve > > On routine visual inspection of an income PCB board we found a type of the > defect > that is not specified in any of the IPC standards (e.g IPC-A-600 > Acceptability of Printed Boards). > > It looks like wrinkles on pads and conductors (see fig 1 in the > attached file). We suspected that it was caused > by thick copper conductor on the second layer (under the outer layer). > > We measured the copper and the dielectric thickness between the outer and > the second layers > and found that the copper thickness on the 2nd layer was relatively high > (70 micro-meter), and the > dielectric thickness lower than specified (only 50 microns). > > Have you seen similar defect? > What is the reliability impact? > Is it acceptable for class 3? > > Best regards > Mordechai Kirshenbaum > MOD, Israel > > P.S. please feel free to post this question on the technet forum. > > > > > > > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________