Hi Susan, I certainly would strongly lean towards IPC-6018 (HDI), para 3.6.1. However, even this needs changing to 260°C. Regards, Werner Engelmaier Engelmaier Associates, L.C. Electronic Packaging, Interconnection and Reliability Consulting 7 Jasmine Run Ormond Beach, FL 32174 USA Phone: 386-437-8747, Cell: 386-316-5904 E-mail: [log in to unmask], Website: www.engelmaier.com ************************************** See what's free at http://www.aol.com.