ExtremA, class-A strikes back?

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> I'm surprise there's no other companies interested in competing with Keratherm Kerafol!

It is not to difficult to understand.
Such a foil has to be thin to be effective.
But it also has to be a good insulator at the same time, e.g. at least 300V, preferably 1000V.
So the bulk material has to be some ceramics that is thermally conductive.
The best is Beryllium Oxide, which is now forbidden (Be is toxic) and unobtainium.
The next is AlN, which is expensive.
That leaves Al2O3, which is cheap and easily available.

Tightly packed Al2O3 powder still only has a volume fraction of about 65%.
You can now fill the void with a thermal plastic, and extrude them onto a carrier fabric.
And you will end up with something like a Kerafol.

Of course I have not forgotten the best material which has high thermal conductivity but also high electrical resistivity.
A diamond foil will be 60x better, but probably more than 100x more expensive.
Too bad that it is sandwiched between your device and the heat sink, and you cannot show it off.

:)


Patrick
 
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