Thanks Mike, We are seeing inconsistencies in hole fill during wave solder on a card that was previously immersion Ag finished and yielded minimal hole fill problems. It is true that we may be able to overcome the inconsistencies by process changes (i.e. selective pallet redesign, different fluxes/preheat settings, etc.) but first we would like to understand; 1. Is OSP uniformly coating the inside of PTH barrels on virgin PCBs and to what extent is PCB thickness and/or hole size affecting the coating thickness. 2. Is CuO present in barrels in virgin cards. (Could perform x-sections and analyze but this could be hit and miss.) 3. Is CuO present after 1 SMT reflow, 1 aqueous wash, 2 SMT reflows, 2 aqueous washes, etc. Thanks all, Peter -----Original Message----- From: Barmuta, Mike [mailto:[log in to unmask]] Sent: Thursday, March 25, 2004 3:25 PM To: 'TechNet E-Mail Forum.'; 'Peter Verbiest' Cc: Barmuta, Mike Subject: RE: [TN] Measuring OSP in PTH's Peter: You may want to check the TechNet archives there's a lot of information on OSP coatings. The coating itself is a reaction mechanism with the exposed surface copper of the PCB. It forms be a uniform thickness on the holes and surfaces and is pretty much self limiting. It is not like a paint or even a rosin type coating that would have various types of build-up thickness at edges, lips, large flat areas, etc. Where viscosity and topography can affect the deposit thickness. It is possible that extremely small vias may not have the same amount of coating due to solution transfer and rinsing. However I've never found that to be a problem. What exactly is it that you are trying to determine? Are you having process problems? There are many things that can impact this and ways to measure, test and overcome them depending on the situation. Regards Mike Barmuta Staff Engineer Fluke Corp. Everett WA 425-446-6076 -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Peter Verbiest Sent: Thursday, March 25, 2004 1:18 PM To: [log in to unmask] Subject: [TN] Measuring OSP in PTH's Hi All, I have a need to better understand the distribution of OSP (i.e. Entek Cu-106 A) along the wall surfaces of different size PTH's. I would appreciate any literature, ideas, or recommendations on approaches to collect such information. Thank you, Peter Verbiest Jabil Circuit San Jose, CA --------------------------------------------------- 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 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- 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 847-509-9700 ext.5315 -----------------------------------------------------