Phil,

So the following is of concern:

:The thickness of the intermetallic formed by thermal aging had little
effect on the peel strength until the intermetallic thickness reached above
25 microns (0.001 inch). Then the lead rich layer appeared to be a major the
contributor, it formed large lead crystals the fractured easily along grain
boundaries."

Is this then a thickness specification not to be exceeded, and how easily
under what conditions did the fracture occur?

Earl

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