RE: [TN] Saponifiers and no-residue/no-clean fluxesThe casper effect you refer to is caused by incomplete cure of the mask, moisture or volatiles become entrapped (typically during wave solder but often exhibiting itself during the post cleaning process...we've seen this before as well, these boards were baked at low temperature and the "white" disappears... Don't see this too often now... As for solder going under the mask and lifting, well thats a pre-cleaning issue there...without a good surface to bond to the mask is going to lift with just the slightest stress (heat, force, chemical) applied... What I was referring to was what affects saponifier may have on solder mask, specifically, the application of 100% saponifier Good thoughts...thanks Franklin ----- Original Message ----- From: Charlie Pitarys To: [log in to unmask] Sent: Wednesday, April 16, 2003 8:39 AM Subject: Re: [TN] Saponifiers and no-residue/no-clean fluxes Hi Frank, Yes there has been some issues off and on in the past. Yes certain dry film types cannot stand up to saponifiers (no matter who makes the juice), semi-aqueous solvents and even high pressure spray have all been the culprit? However the I believe the majority of problems can be traced back to how they are processed at the board level. On LPI type masks the UV cure has a big impact. (testing has been done to prove this) Try to rush this step and you will see issues like the green turning ghostly white. The wash step basically exposed the defect. I have seen hot water alone cause this "Casper effect". I believe Steve G. has seen this come and go in the past. A CM will get 10K boards made and the problem shows up on less then 1%. I have also seen on one occasion where the mask was lifted by the reflowed solder wetting up under the mask following the trace and causing it to lift or bubble. Then when exposed to spray wash it blew it off.(I have pictures) This is definitely a problem at the board level. Once again the wash step exposed the defect. To see the sporadic nature of this problem, search the [TN] archives. Frank if you have further questions, do not hesitate to call. Best regards, Charlie Pitarys Director of Application Technologies 603.622.2900 X-115 www.kyzen.com -----Original Message----- From: Franklin D Asbell [mailto:[log in to unmask]] Sent: Thursday, April 10, 2003 5:40 PM To: [log in to unmask] Subject: [TN] Sapponifiers and no-residue/no-clean fluxes Any of you had experiences with sapponifiers affecting solder mask integrity? Franklin --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------