Hi Gregg,
Get yourself a copy of IPC-D-279, look at appendix A, it is all there. Of 
course, you have to have some dimensions, properties, and operating conditions.

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



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