In another embodiment, the facecoat region is formed from {HEAD ~ a slurry composition} including zirconium silicate and {TAIL ~ silica} with stucco layer of alumina is included 
including
In another embodiment , the facecoat region is formed from { HEAD ~ a slurry composition } including zirconium silicate and { TAIL ~ silica } with stucco layer of alumina is included
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH