Hi Ed, You do not say how large the LCCCs are nor on what substrate they are mounted. However, with this much Au in a vibratory environment one does not even have to consider cyclic thermal expansion mismatches—these assemblies are in trouble. Some standard MIL vibration testing should give you a good indication and convince management. That way you do not have to perform the more resource-intensive thermal cycling. The various Mantech studies (Martin-Marietta, early 1990's; etc.) should also give you good information just on LCCCs on polymeric substrates. 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] ################################################################ TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################