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