All

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 D25 Biomedical and Dental Materials D001697 +
  D25.720 Polymers D011108 +
   D25.720.716 Plastics D010969 +
     D25.720.716.392 Nylons D009757 
     D25.720.716.507 Polyethylenes D011095 +
     D25.720.716.550 Polypropylenes D011126 
     D25.720.716.579 Polystyrenes D011137 
     D25.720.716.650 Polyurethanes D011140 
     D25.720.716.721 Polyvinyls D011145 
     D25.720.716.822 Resins, Synthetic D012117 +