In a series of tests for the 4553 document, the most important result was to prevent air flow over the part - so in your case just replace it into the bag and fold over the edge - I have data from 850+ days for Ag stored in a bag not sealed. I do not know who you are buying boards from but our adder for Ag as a replacement to HASL is maybe $3/panel - I wish we could get $6/board Regards Gerard -----Original Message----- From: Phil Nutting [mailto:[log in to unmask]] Sent: Wednesday, March 30, 2005 9:19 AM To: TechNet E-Mail Forum; Gerard O'Brien Subject: RE: [TN] Lead free solder HAL And what is the protocol if I open the bag and use three out of ten? How do I reseal the bag for long storage life? On a recent quote Immersion Silver jumped my cost by $6.00 per board. In this day of customers wanting cost reductions it is hard to justify materials and parts cost increases. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Gerard O'Brien Sent: Wednesday, March 30, 2005 8:41 AM To: [log in to unmask] Subject: Re: [TN] Lead free solder HAL If you leave them in their original packaging then they will last many years. The 4553 document covering I Ag deals with this subject. Regards Gerard O'Brien Photocircuits Corporation Co-chairman 4-14 plating committee -----Original Message----- From: TDK [mailto:[log in to unmask]] Sent: Wednesday, March 30, 2005 8:40 AM To: [log in to unmask] Subject: Re: [TN] Lead free solder HAL I had heard that Immersion Silver finish will tarnish in approx. 6 months, so it isn't a good option for PCB's that will be stored for awhile. Did I hear correctly ?? Regards TDK -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting Sent: Wednesday, March 30, 2005 6:30 AM To: [log in to unmask] Subject: Re: [TN] Lead free solder HAL Will there be a tarnish issue after long storage periods? Frequently we may order a few more boards than actually used and these would then sit on the stockroom shelf, typically not in a sealed bag. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush Sent: Wednesday, March 30, 2005 8:04 AM To: [log in to unmask] Subject: Re: [TN] Lead free solder HAL Leadfree solders in PCB fabrication are more difficult to use than standard solders alloys and present problems in equipment and processing. I am sure you will here that it is something that can be done easily and many are doing it, but this is sales speak more than fabrication logic. I see the real winner in leadfree surface finish for PCB being immersion silver. This is where the majority of the development effort is going and as such the resulting products are becoming hardened for multiple thermal cycles at LF reflow and pot temperatures in the assembly processes. I see that some specific applications are valid for ENIG, Immersion Tin and some of the new OSP lines, but I believe silver will be the finish of choice. Jeffrey Bush Director, Quality Assurance and Technical Support VERMONT CIRCUITS INCORPORATED 76 Technology Drive - POB 1890 Brattleboro, Vermont 05302 Voice: 802.257.4571.21 Fax: 802.257.0011 http://www.vtcircuits.com -----Original Message----- From: Russell Burdick [mailto:[log in to unmask]] Sent: Wednesday, March 30, 2005 7:19 AM To: [log in to unmask] Subject: [TN] Lead free solder HAL Good Morning Technet, I am at the early stages of learning about lead free solder as an alternative option to our current tin/lead solder HASL. Is there anyone out there who can comment about their experiences? Currently I have no customers requesting this process, but I need to be ahead of this need when feasible. Vendors have provided both sides, yes PCB makers are doing it and a large PCB maker tried it and discontinued using it. Thanks in advance. Russ Burdick, trying to lessen the HASL hassle --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------