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