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