unvulcanised

/ʌnˈvʌlkənaɪzd/
adjective
  1. Not treated with sulfur or other chemicals to make rubber stronger and more elastic; raw rubber that has not undergone vulcanization.
    • Factories must handle unvulcanised rubber carefully because it degrades quickly.
    • Unvulcanised natural rubber is used in some adhesives and sealants.
    • The unvulcanised rubber was too soft and sticky to use for tires.
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