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Answer for the clue "Hard rubber substance ", 7 letters:
ebonite

Alternative clues for the word ebonite

Word definitions for ebonite in dictionaries

WordNet Word definitions in WordNet
n. a hard nonresilient rubber formed by vulcanizing natural rubber [syn: hard rubber , vulcanite ]

Wiktionary Word definitions in Wiktionary
n. The relatively hard product of vulcanizing natural rubber with sulfur; vulcanite

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ebonite \Eb"on*ite\, n. (Chem.) A hard, black variety of vulcanite. It may be cut and polished, and is used for many small articles, as combs and buttons, and for insulating material in electric apparatus.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1860, from ebon + -ite (1).

Usage examples of ebonite.

With a fretsaw I cut these down to smaller plates, discarding the ebonite at the edges, which was green with age, and turned them on a lathe, in a foul cloud of black dust that got into my hair, eyes, teeth, fingernails.