Well given the properties of ceramics, in general, they can withstand a lot of heat and aren't exactly something that warp easy (most will average in the 2500*F range and special types well over 5,000*). But on the other hand, depending on the grade/type of ceramic, they can be extremely brittle which is the part I'm still trying to figure out why those few that are running ceramics and have detonated on them slightly and had no damage are giving credit to the ceramic for not breaking like steel seals probably would. The main issue is none of the ceramic seal makers will divulge the technical information of the construction of them.
I'm actually amazed I remember any of this from my science classes
