Hal, What it looks like to me is scratches from the hot air solder knife blades when exiting the HASL machine, which probably is conductive. Do the marks have a "pattern" to them?(same direction) Tony Steinke AIT-Atlanta Inc. ----- Original Message ----- From: "Hal Winslow" <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, August 18, 2003 2:08 PM Subject: [TN] Is HASL adhered to conductors acceptable? > Hello all, > Sort of a rehash of last week's question, but here we go... > > I have bare boards, .062 thick, double sided, LPI solder mask, that are a > HASL finish. > > There is solder adhered to the (soldermask coated) conductors, and also to > the LPI between conductors. On the last batch of boards, the fabrication > house was of the opinion that this wasn't a defect where there was solder on > the conductors. > > Unfortunately I don't have IPC specs in front of me to pore through, but on > our fab drawing, we reference the following: > > Latest version of all referenced specifications to be used. > Fabricate in accordance with IPC-A-600, class 2. > Inspect in accordance with IPC-6012, class 2. > Use LPI solder mask over bare copper per IPC-SM-840 Class 2. > > I've emailed pictures to Steve, should be hosted soon at > http://www.stevezeva.homestead.com/ > > Sorry for the rambling, but I guess I can boil the questions down to: > > 1. Is it acceptable (per above specs and class level) for there to be > solder adhered on top of traces that are (by design) covered by soldermask? > > 2. The metalization in the areas of mask not on conductors certainly > appears to be solder, although the last batch I sent back they thought it > was burnished mask. My in house analysis is limited to a microscope that > can zoom to 40X, but that's about it. > > Any suggestions would be welcome. > Thanks, > Hal > > --------------------------------------------------- > Technet Mail List provided as a free 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/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 1.8e 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------