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