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