Hi Steve, In my experience not feasible. If you want an independent opinion ask DuPont but I think they will give you the same answer. Good luck. Steve Kelly PFC Flexible Circuits Limited Ph: (416) 750-8433 Fax: (416) 750-0016 Cell: (416) 577-8433 E-Mail: [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Stephen Gregory Sent: Thursday, June 02, 2005 6:36 PM To: [log in to unmask] Subject: [TN] Dry Film "Soda Strawing"...an update. Hi all! We just had a conference call with the fab vendor about our soda strawing issue. They acknowledged that the fabs are defective, but asked for a deviation to notes on the fab drawing. We can't approve any deviation without asking our customer first. The drawing calls out for 4-oz copper, and 4-mil dry-film solder mask. The mask being used is Dupont Vacrel 8140. The assembly is a power supply. They want to apply a LPI, then apply the dry film. I understand that applying a 4-mil dry film over 4-oz. copper traces is difficult and challenging, but can it be done without these kind of soda strawing defects? Kind regards, -Steve Gregory- Senior Process Engineer LaBarge Incorporated Tulsa, Oklahoma (918) 459-2285 (918) 459-2350 FAX __________________________________________________________________ This message may contain information that is privileged and confidential to LaBarge, Inc. It is for use only by the individual or entity named above. If you are not the intended recipient, you may not copy, use or deliver this message to anyone. In such event, you should destroy the message and kindly notify the sender by reply e-mail. --------------------------------------------------- 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 -----------------------------------------------------