The roller or whatever mechanical instrument is used to press the solder mask has a debris that is wearing out as it rolls over the boards. That foreign material ( in shape of a man sitting and holding a Frisbee in his right hand and waving bye with it) is leaving an imprint on the boards. The operator more than likely already cleaned the evidence. Regards, Ramon Inge: The name is Wee Mei -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Ingemar Hernefjord Sent: Thursday, December 08, 2005 12:31 PM To: [log in to unmask] Subject: [TN] SV: [TN] What is this solder mask defect? Woe, Wee, Have seen something like. In our case it was a repetetive mechanical damage, kind of small imprint, was quite harmless. Inge > > Hello, > > The suspect is completely flat and smooth to touch. An interesting > observation is that though it appear at the same location for all the > 10pcs of board, the size of the image tend to get smaller and smaller > if the boards are arranged starting with the largest image. It can't > be soda strawing as it is not on trace. It can't be pink ring as it is > not around hole. What can it be? What is the likely cause? > > Will ask Steve to put it up. Kindly take a look. Your opinion is greatly > appreciated. > > Regards, > Wee Mei > > --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- Like other forms of communications, email communications may be vulnerable to interception by unauthorized third parties. 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