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