The thermosetting material contains {TAIL ~ a refractory metal} capable of reacting with {HEAD ~ boron} to form a metal boride 
The thermosetting material contains { TAIL ~ a refractory metal } capable of reacting with { HEAD ~ boron } to form a metal boride
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH