The amount of the metal contained in {HEAD ~ the flexible thermosetting resin} and the thermosetting resin containing {TAIL ~ the boron} is preferably present in excess of the amount stoichiometrically necessary to combine with the boron present 
The amount of the metal contained in { HEAD ~ the flexible thermosetting resin } and the thermosetting resin containing { TAIL ~ the boron } is preferably present in excess of the amount stoichiometrically necessary to combine with the boron present
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH