Glass, alcohol and {HEAD ~ a small amount} of water are placed in {TAIL ~ a ball mill}, and mixed and ground therein for about 20 hours to give an average glass particle diameter of about 1 5 μm 
are placed in
Glass , alcohol and { HEAD ~ a small amount } of water are placed in { TAIL ~ a ball mill } , and mixed and ground therein for about 20 hours to give an average glass particle diameter of about 1 5 μm
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL 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