Any thermal grease you'd normally get in the store for a reasonable price will be loaded with Zinc Oxide - it's cheap and gets the job done for most applications. I wouldn't expect to see anything as exotic (and expensive) as BeO in anything besides an old military/aerospace assembly (this thread is the first time I've heard of BeO-loaded grease - I've only seen it in the ceramic TO-3 and TO-220 insulators).
High performance greases these days can be loaded with aluminum oxide or silver (the "Arctic" thermal comounds). I just bought a small syringe of high-performance grease from MG Chemicals that is loaded with Boron Nitride. This is a high performance material that doesn't have the toxicity issues of BeO. Boron Nitride is also used in the very high performance silpad-type insulators. I'm using the Boron-nitride loaded grease for some Class-A apps that need a little extra edge in conductivity. I'm also using aluminum oxide ceramic insulators for the same reason.
High performance greases these days can be loaded with aluminum oxide or silver (the "Arctic" thermal comounds). I just bought a small syringe of high-performance grease from MG Chemicals that is loaded with Boron Nitride. This is a high performance material that doesn't have the toxicity issues of BeO. Boron Nitride is also used in the very high performance silpad-type insulators. I'm using the Boron-nitride loaded grease for some Class-A apps that need a little extra edge in conductivity. I'm also using aluminum oxide ceramic insulators for the same reason.
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