In faster RIM type systems, {TAIL ~ the faster MDI} would normally be the diisocyanate of {HEAD ~ choice} 
In faster RIM type systems , { TAIL ~ the faster MDI } would normally be the diisocyanate of { HEAD ~ choice }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD