It's very late run ceramic. Ceramic for chip
substrates only comes from a
few vendors one being a beer maker in the rockies a few in the far east and
Europe.
heh... actually, Adolph Coors spun-off its non-brewery assets in 1992
into ACX Technologies, and most recently, CoorsTek (formerly Coors
Ceramics) was spun-off into a wholly separate company on Jan 1, 2000.
-dq