By shelf life - I presume you mean "can the boards be solder assembled successfully, if they were made correctly and handled correctly." Joint IPC/JEDEC specification J-003 will tell you how to test the solderablity of printed circuit boards so that you can estimate whether they will solder for you, at any point in their life. In this method, there is a standard flux, and the standard has been updated for the use of lead-free solder. However, your boards may have not been made or handled correctly, or you may have a very mild flux/assembly cycle, so no IPC document will tell you exactly how long boards remain solderable - just how to make them to spec, store them to spec, and to test them with a standard solderablity method. You may also want to to check the manufacturing standards for various board finishes ENIG to OSP - IPC Standards 4552 to 4555. They will have comments about various finishes and shelf life. For instance, my copy of Immersion Silver spec 4553 states " The deposit has demonstrated the ability to meet a shelf life of 12 months per IPC J-STD-003 and industry data, when handled per this specification’s requirements." Reuven has given guidelines that he follows, and there are numerous literature references to comparisons of "shelf life" between finishes. However, I suspect you will end up with the Doug Pauls answer - "It depends". Denny Fritz MacDermid, Inc -----Original Message----- From: Reuven Rokah <[log in to unmask]> To: [log in to unmask] Sent: Tue, Sep 8, 2009 7:00 am Subject: Re: [TN] shelf life of pcbs HASL LF or SnPb 12 months mm. Ag, Imm Sn, OSP 6 months NIG 6 - 12 months Best Regards Reuven ROKAH Think green before printing this mail... Thanks ----Original Message----- rom: TechNet [mailto:[log in to unmask]] On Behalf Of ?efika ?zkal ent: Tuesday, September 08, 2009 8:24 AM o: [log in to unmask] ubject: [TN] shelf life of pcbs Dear Technetters, would like to get information about shelf life of pcbs. I know they change ith the finish type of the pcbs but is there an IPC Standard which defines he shelf life of pcbs for different finishes? hanks efika Ozkal SELSAN INC. ----Original Message----- rom: TechNet [mailto:[log in to unmask]] On Behalf Of stephengregory5849 ent: Sunday, September 06, 2009 3:31 AM o: [log in to unmask] ubject: Re: [TN] [LF] electronics recycling in China Robin, Thank you for sharing the "rest of the story". I watched the 60-minutes tory last Sunday, and was thinking that there wasn't any e-waste recycler n the US that you could trust. You have totally changed what I now think. hank you, and kudos to you and Retroworks for what you do. I wish there ere more like you. Steve Gregory ----- Original Message ----- rom: "Robin Ingenthron" <[log in to unmask]> o: <[log in to unmask]> ent: Saturday, September 05, 2009 7:12 PM ubject: Re: [LF] electronics recycling in China Bolb, Actually, I was interviewed for 3 hours but wasn't ultimately=2 0used as a source because a) it didn't fit in their 8 minutes, and b) Scott Pelley was really thrilled to have someone try to take his camera away. While the story is true, it omits a key step in the chain. * Here is the rest of the tory<http://retroworks.blogspot.com/2009/08/cbs-60-minutes-wasteland-unseen footage.html>. * On Sat, Sep 5, 2009 at 5:57 PM, Bob Landman <[log in to unmask]>wrote: > This piece on electronics recycling ran on 60 Minutes Sunday August 30, > 2009. > It's a repeat program that originally aired in November 2008. > > The Electronic Wasteland > http://www.cbsnews.com/video/watch/?id=4586903n > > This is the reason lead in solder is being banned. > > Instead of fixing the problem, a new one (lead free manufacturing) has > been > created. > The result (reduced reliability of electronics) will be far worse on > human > life (in toto) > than the pollution seen in this video, IMHO. > > Bob Landman, President > Life Senior Member, IEEE > IEEE Power & Energy/Reliability Societies > IEEE Standards Association > H&L Instruments, LLC > www.hlinstruments.com > > --------------------------------------------------------------------------- --Leadfee > Mail List provided as a service by IPC using LISTSERV 1.8d > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Leadfree > To temporarily stop/(start) delivery of Leadree for vacation breaks send: > SET Leadfree NOMAIL/(MAIL) > Search previous postings at: http://l istserv.ipc.org/archives > Please visit IPC web site > http://www.ipc.org/contentpage.asp?Pageid=4.3.16for additional > information, or contact Keach Sasamori at > [log in to unmask] or 847-615-7100 ext.2815 > > --------------------------------------------------------------------------- -- > -- Robin Ingenthron --------------------------------------------------------------------------- --Leadfee Mail List provided as a service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Leadfree To temporarily stop/(start) delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL/(MAIL) Search previous postings 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 --------------------------------------------------------------------------- -- --------------------------------------------------- echnet Mail List provided as a service by IPC using LISTSERV 15.0 o unsubscribe, send a message to [log in to unmask] with following text in he BODY (NOT the subject field): SIGNOFF Technet o temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) o receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest earch the archives of previous posts at: http://listserv.ipc.org/archives lease visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 or additional i nformation, or contact Keach Sasamori at [log in to unmask] or 47-615-7100 ext.2815 ---------------------------------------------------- ##################################################################### ikkat: Bu elektronik posta mesaji kisisel ve ozeldir. 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