Richard Sure sounds like a vendor fault, probably an insufficiently cured mask. The puzzling thing, though, is how they went through the HASL and the wash without it happening. FWIW Brian "Richard E. Ackerson" wrote: > > I am looking for some input regarding a possible cause for a problem we are > having with one board, part number. > > We recieved a lot of boards from a vendor, all with the same date code. This is > one of meny boards we have recieved and are still recieving. > This board, however, is causing problems after wave soldering, by the soldermask > peeling, reveling bare copper. > > The boards are 4 layers, with a thickness of .093". They are SMOBC/HAL boards. > > The boards are assembled and then wave soldered using water soluble flux. The > mask begins peeling during water wash in our Trieber SMT Cleaner. > > The wave temperature is 500F. Kester Water soluble flux #2235 is used with > Kester #4662 thinner to reach SG. The flux is applied with a foam fluxer. > Preheat temperature is 220F. > > The mask does not peel prior to wave soldering, only after. > > My inital feelings is that there was contamination left on the copper prior to > the soldermask operation. The vendor feels, since the mask dosen't peel prior to > wave soldering, and didn't peel prior to their shipping, the problem is in our > process. > > This is occurring with one part number, one single lot of boards from one > vendor. We have not experienced this situation with any other of this vendors > boards, or any othe vendor's boards. > > Any Ideals? > > All input will be appreciated. > Sincerely, > > ____________________ > Richard E. Ackerson > Sr. Industrial Engineer > ABB Automation, Inc. > Electronics & Systems Assembly > Phone: 440-585-7646 > Fax: 440-585-8860 > [log in to unmask] > > --------------------------------------------------------------------------------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 > --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------