I was under the impression that firebrick would be tougher than castable, due to it's controlled curing during it's manufacture. That because of the controlled curing and perhaps the aggregate inside, that it would last longer, and perhaps due better with the thermal shock and expansion. Can some elaborate on this?
Forum Issues Update
Things are progressing in getting things back in order on the Forum! User avatars should be showing up. Attachment and inline images are in the process of being uploaded. We are still looking for a migration path for the Photoplog gallery. Thank you for your patience!
Castable vs firebrick...which is tougher