Frank - provided that the final rinse post oxide is DI and that you achieve the necessary cleanliness levels (SEC and SIR) then the rinse water prior to resist application is not important. Back in the day of Bellcore/ Telcordia - the requirements were SEC and SIR post oxide since this is the last rinse step prior to lamination. Remember also that the cores will see multiple rinse steps during DES prior to oxide as well - Just my two cents Regards Gerard O'Brien Photocircuits Corporation -----Original Message----- From: Frank Conti [mailto:[log in to unmask]] Sent: Thursday, March 16, 2006 9:29 AM To: [log in to unmask] Subject: [TN] D.I. RINSE Technetters: A question for all pcb fab experts. Having a disagreement in house on the importance of a D.I. rinse (compared to a fresh water rinse) after chem. clean for inner layer cores prior to resist application. How important is a D.I. rinse or rinses. Your input is very much appreciated. Thanks Frank Conti Quality Process Tech. Triangle Circuits of Pgh. Phone: 412.828.5322 ext 627 E-Mail: [log in to unmask] --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------