noun
hard rubber; ebonite; vulcanite
Refers to rigid, hardened rubber materials such as ebonite or vulcanite, often used in industrial or electrical contexts.
硬質ゴムは電気絶縁体として使われることがある。
Hard rubber is sometimes used as an electrical insulator.
軟質ゴム is soft rubber, contrasting with the rigid, hardened nature of 硬質ゴム.
Compound of 硬質 (hard, rigid) and ゴム (rubber, from Dutch 'gom').