Firebrick ratings

If I am building a rmh with a ceramic wool insulated 8" core, what temperatures should I expect? I can get 2300 to 2600 rated brick and beyond from a local provider. I would rather use the 2300 because it is cheaper. Just wondering if anyone has had any problems due to brick failure.

Matt, I was wondering the same thing since I like to build stuff that will both last and provide as maintenance free service as possible. Planning on building an 8" RMH this Fall myself. Anyway, I found the post by Erica Wisner in Allen Lumley's "Fake Fire Brick" thread to be very informative, to say the least:

https://permies.com/t/30551/rocket-stoves/Fake-fire-brick

In my RMH burner I'm contemplating using 2300°F fire brick for the base/floor, then switch to the more expensive 2600°F fire brick for the burn tunnel sides and bridge.

And for the heat riser, 2600°F fire brick splits, insulated with ceramic blanket wrap.

HTH, Byron

That was a very informative response and I thank you for directing me. My plans are the same as yours. This fall I plan on building one out of the dense firebrick I believe to withstand abuse.