87041650
May 18, 2016
engineered precast refractory shapes not of metal for use in the heat processing industry by glassmakers, aluminum and steel foundries, and petrochemical manufacturers, including refractory shapes of high purity alumina, alumina chrome, andulsite, mullite, sillimanite, silica, Alumina-Zirconia-Silica, zircon, and fireclay
Nonmetallic Building Materials