Two mils sounds quite good for such a package. Your machinist can definitely make a more precise measurement. The official definition of the package type likely has a flatness requirement, and it's this that you should design for or at least be prepared to deal with.
Joe Gwinn
Honeywell does 8.5 with PTM7950 etc.
It's a phase change material
If you want a small quantity to experiment with (too small for Honeywell to bother with), enough for several CPUs, Linus Tech Tips sells it:
That's where I heard about it, but upon searching there are several competing vendors for retail quantities of this product.
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