Pat,
Fraunhofer Institute in Berlin came up with a way to test for a feature called
Equiresistant Temperature at which the mechanical properties of solder changes
from OK to very weak.
I think their number for Sn63 was 148'C. Do not know what you call 5S solder
so cannot give you a number for that. Fraunhofer has tested a number of
solders and may have the other one in their data.
Phil Hinton
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