The urethane prepolymer is {HEAD ~ the reaction product} of {TAIL ~ a dihydroxy functional polyol} and an isocyanate 
of
The urethane prepolymer is { HEAD ~ the reaction product } of { TAIL ~ a dihydroxy functional polyol } and an isocyanate
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH