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