In a message dated 4/19/2006 12:02:59 PM Eastern Daylight Time, [log in to unmask] writes: Does IPC have such a specified standard or paragraph informing self life of lead free coated bare PCB Shelf life is an issue that IPC does not specify. The reason is that the storage conditions vary around the world, and from season to season. The solderable life in Singapore could be a lot less than in Minneapolis. What is specified are "stress conditions" and "stress methods" that you can use to determine if your part will still solder, after storage. Or, you can use the stress methodologies to determine that the incoming part you receive today will have the same storage capability as the part you received last week. Hopefully, IPC methods will tell you if you are getting good parts consistently, and not getting poor storage parts occasionally. Denny Fritz IPC Task group chairman 5-23d, Alternate Board Finish Solderability Testing. MacDermid, Inc. --------------------------------------------------- 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 -----------------------------------------------------