In addition to the spinel-containing refractories discussed above, other types of
spinel-containing refractory, e.g., MA–M2S, MA–A3S2, MA–CA6, and MA–
Al2TiO5, are being developed and some promising results have been obtained.
For example, M2S–bonded MA bricks show very good alkali resistance (73)
and MA–Al2TiO5 refractories show good thermal shock resistance (74).