硬こう化かゴム

noun

vulcanite; ebonite

A hard, black rubber material made by vulcanizing natural rubber with a high sulfur content. Used for electrical insulation, combs, and mouthpieces.

• 硬こう化かゴムは電でん気き絶ぜつ縁えん体たいとして使つかわれる。

  Vulcanite is used as an electrical insulator.

• このパイプのマウスピースは硬こう化かゴム製せいだ。

  The mouthpiece of this pipe is made of ebonite.