http://www.sandia.gov/media/rhp.htm -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Bob Metcalf Sent: Monday, September 26, 2005 12:28 PM To: [log in to unmask] Subject: Re: [TN] lead free PCB Replacement Coatings Bill, As George indicates below, users of each surface finish will be biased toward the finish they are using. The truth be told, both finishes work well. ENIG has had a past history of field failures, but in recent years problems have been a lot less common. ENIG does require more process control at the fabricator, but you can have problems with silver if the process is not controlled. George makes a good point that a fabricator that has only one of the finishes will try to persuade you to their finish of choice. The best bet is to talk to a fabricator that uses both finishes. If you need help finding someone that uses both finishes, contact me off line. I have a couple of customers that use both and I am sure I could get someone that would be willing to share their experiences. Regards, Bob Metcalf Circuit Solutions 949-709-2544 -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Wenger, George M. Sent: Sunday, September 25, 2005 9:51 AM To: [log in to unmask] Subject: Re: [TN] lead free PCB Replacement Coatings Bill, Those who like ENIG (Electroless Nickel under Immersion Gold) are going to tell you it's great and there should be no problems with using it with SAC305 and VOC-Free flux. Those who use IAg (Immersion Silver) are also going to tell you it's great and there should be no problems with using it with SAC305 and VOC-Free flux. I'm one of those who use IAg and believe that it is a good surface finish for standard SnPb assembly or Pb-Free assembly. If I were to tell you about the potential problems with using ENIG there would be those out there who would tell you that there aren't any problems. I would suggest that you not listen to any PCB fabricator who can only provide with one or the other and I also wouldn't listen to any supplier who sells surface finish chemistry. Ask as many PCB users as you can and find out what their experience has been with different surface finishes and then make an informed decision. As I indicated, IAg is the surface finish we prefer. But as I indicated I'm only one user. Regards, George George M. Wenger, Andrew Corporation Reliability / FMA Engineer Base Station & Subsystems Group 40 Technology Drive, Warren, NJ 07059 (908) 546-4531 [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask] Sent: Sunday, September 25, 2005 12:32 PM To: [log in to unmask] Subject: Re: [TN] lead free PCB Replacement Coatings To All: Have have read many articles regarding what folks are recommending as replacement coating for HASL. What are folks experiences with Electroless Gold and also Electroless Silver? Is one substantially cheaper than the other? Are there benefits of one over the other? Will either cause any potential problems when using SAC 305 and a VOC free flux? Thanks in advance for help with these issues!!!!!! Bill Black Q.A. Manager Medco 631-667-9699 [log in to unmask] (mailto:[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 ----------------------------------------------------- ---------------------------------------------------------------------------- -------------------- This message is for the designated recipient only and may contain privileged, proprietary, or otherwise private information. If you have received it in error, please notify the sender immediately and delete the original. Any unauthorized use of this email is prohibited. ---------------------------------------------------------------------------- -------------------- [mf2] --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------