Hi Seth -

The folks at Enthone-OMI, DuPont Electronic Materials and Lackwerke/Peters all
supply via fill materials of varying thermal conductivities.  The advantage of
these materials over a solder filled via, is that they do not change when
subjected to soldering temperatures.  Believe me, a solder filled via which
disperses part of its contents under a large quad pack or similar can be a
mess to deal with.

Regards - Kelly

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