#India_rubber__rubber__gum_elastic__caoutchouc  latex from trees (especially trees of the genera Hevea and Ficus)
  supertype:  #latex  a milky exudate from certain plants that coagulates on exposure to air
  subtype:  #foam_rubber  spongy rubber; made by introducing air bubbles before vulcanization
  subtype:  #crepe_rubber__creperubber  crude natural rubber; used mainly for shoe soles
  subtype:  #synthetic_rubber__syntheticrubber  any of various synthetic materials that resemble rubber
     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
  subtype:  #cold_rubber  a rubber made at low temperatures (5 degrees Centigrade) which is tougher than conventional rubber and is often used in car tires
  subtype:  #hard_rubber__vulcanite__ebonite  a hard nonresilient rubber formed by vulcanizing natural rubber
  subtype:  #Para_rubber  a type of South American rubber

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