#synthetic_rubber__syntheticrubber  any of various synthetic materials that resemble rubber
  supertype:  India_rubber__rubber__gum_elastic__caoutchouc  latex from trees (especially trees of the genera Hevea and Ficus)
  subtype:  silicone_rubber  made from silicone elastomers; retains flexibility resilience and tensile strength over a wide temperature range
  subtype:  neoprene  resistant to oils and aging; used in waterproof products
  subtype:  Buna  made by polymerizing butadiene
  subtype:  Butyl  made by polymerizing isobutylene

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