Hi all, There are many thermal shock tests for via reliability, like AATC(air-to- air thermal cycling), LLTS(liq-to-liq thermal shock), hot oil, IST, solder float. How do I select appropriate test for my PCB? For the same product, different test must have different test cycles to see the results. Do the test cycles in various tests have relationship, like how many cycles in IST are equivalent to how many cycles in AATC, LLTS, hot oil or solder float? Did anyone do this study before? Or do any document refer to this? Thanks! Steven --------------------------------------------------- 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 -----------------------------------------------------