Sorry for the delay. Apparently this app doesn’t tell me when people reply.

Most of what I make ends up in space. We use pyrolytic graphite, which we actually make ourselves on site, which can stand up to some pretty extreme temperatures with very little expansion or contraction. There are other applications as well, mostly involving any situation where conductivity is important. Some hospital imaging machines use it instead of aluminum in high temperature scenarios. It’s very good at what it does, but its use is fairly limited due to its absolutely insane price tag.