the MRA and the subsequent PR by eestor failed to mention the test which showed a k of 16000 was NOT on a new polymer loaded with CMBT. Rather, it is a densified solid ceramic disc. Course, that's not emphasized. That is not exceptional for a ceramic.
i bet what DW did, was take his CMBT, pressed it into a disc, and sintered it. He did a similar thing a dozen years ago with the "Golla sample"