Due to its high Al₂O�?articles and small impurity amounts, it outperforms fireclay bricks During this element High alumina brick refractories may have two bond units, ceramic, and phosphate. Phosphate brick is readily recognized by a phosphorus pentoxide (P2O5) articles on their own facts sheet of between about 3% and 6%. https://aerogel-powder58136.wikiusnews.com/2105438/a_secret_weapon_for_high_alumina_fire_brick