Another issue arises concerning "exotic" materials as Thermount with a very
high water absorption percentage and OSP's. Imaging using this material with
its associated pre lamination prepreg and core bake and its baking
requirement before assembly, especially in a very uncontrolled high humidity
situation, while using OSP's.

Also, think about using Thermount with plastic BGA's. It's CTE/TCE (changed
for me in 1972 Werner just like ft./lbs to lbs/ft.) is lower than ceramic in
the x/y axis. Negative CTE/TCE I believe it is called.

MoonMan

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