A question of originality

There's a nice little break down of a bunch of brake pad/shoe compounds here. Yes, it's a site mostly for MGB's, but the brake materials covered are all relevant. It covers carbon metallic, carbon kevlar, ferro carbon, and ceramic materials. It's a bit of a read so I'll just link it here, scroll down until you get to the picture of the brake rotor.

British Automotive

Worth posting here is the info on asbestos linings. Their issues are well known, and I'm not just talking about cancer. And much better stuff now exists. From the British Automotive site-

"First of all, brake pads containing asbestos are a thing of the past. I only mention them here as a reminder of their past performance, rather like a belated obituary.

Brake pads containing asbestos were capable of absorbing lots of heat without burning, however, they would begin to glaze as low as 250 degrees F, thereby reducing their coefficient of fiction (COF), and as temperatures reached 350 degrees F, fading would become apparent. Sustained high temperatures would form a glaze deep enough into the pad material that they would, in many cases, never recover. On top of this we knew how inefficient this material became when wet. It is estimated that asbestos brake pads under these conditions lost almost 2/3 of their COF. "May they rest in peace.""

There's also this article from Hemmings. A little lighter on data but it's a more main stream source.
https://www.hemmings.com/stories/2013/08/30/tech-101-how-to-choose-the-right-brake-friction-material

Bottom line is, asbestos sucks. And yes, I'm old enough to have used asbestos brake linings and semi-metallics on the same car. The fact is that there are compounds out there now that will stop your car faster. And that's all you should be worried about unless you park your car in a museum. Stopping faster is better, and since it's unlikely any of us are fitting ABS systems we need all the help we can get if we're out on the streets with modern cars.