The compound includes 72.5% to 77.5% by {TAIL ~ weight} of a first mixture of substantially 18.3% Al2 O3, 29.5% Al2 SiO3 and 41.4% Na2 SiO3 particles on {HEAD ~ a weight basis} 
The compound includes 72.5 % to 77.5 % by { TAIL ~ weight } of a first mixture of substantially 18.3 % Al2 O3 , 29.5 % Al2 SiO3 and 41.4 % Na2 SiO3 particles on { HEAD ~ a weight basis }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD