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