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