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