{TAIL ~ Plastics} which cure in a series of steps having urethane, {HEAD ~ urea}, siloxane and acrylate groups 
{ TAIL ~ Plastics } which cure in a series of steps having urethane , { HEAD ~ urea } , siloxane and acrylate groups
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH