The coated fibrous carbon material is then reimpregnated with {TAIL ~ a second thermosetting resin} containing {HEAD ~ a boron compound} and, optionally, a refractory metal capable of reacting with boron to form a metal boride 
The coated fibrous carbon material is then reimpregnated with { TAIL ~ a second thermosetting resin } containing { HEAD ~ a boron compound } and , optionally , a refractory metal capable of reacting with boron to form a metal boride
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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