Hi Bill, Welcome toTechNet. You write: >Our interests are with the performance of solders and solder joints in >service. We assume that everyone has made a sound joint !! Many of us have been persuingthe same questions for many years--a sound SJ is a basic assumption, even though, of course, bad SJs (in particular improperly wetted ones) have a major impact on infant mortality. If you have not done so, you might want to take a look at IPC-D-279 and IPC-SM-785, as well as the literature. Werner Engelmaier Engelmaier Associates, L.C. Electronic Packaging, Interconnection and Reliability Consulting 7 Jasmine Run Ormond Beach, FL 32174 USA Phone: 904-437-8747, Fax: 904-437-8737 E-mail: [log in to unmask], Website: www.engelmaier.com ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################