1) Black hard rubber 2) Bowling ball material 3) Caoutchouc 4) Clarinet mouthpiece material 5) Common bowling ball material 6) Gum elastic 7) Hard back rubber 8) Hard black rubber 9) Hard rubber 10) India rubber 11) Inelastic rubber 12) Insulating rubber 13) One bite of rubber 14) Rubber 15) Vulcanite
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https://www.crosswordclues.com/clue/ebonite
1) Vulcanite
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https://www.crosswordclues.com/clue/ebonite
Ebonite was a brand name for very hard rubber first obtained by Charles Goodyear by vulcanizing rubber for prolonged periods. It is about 30% to 40% sulfur. Its name comes from its intended use as an artificial substitute for ebony wood. The material is known generically as hard rubber and has formerly been called `vulcanite`, although that name.....
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http://en.wikipedia.org/wiki/Ebonite
• (n.) 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.
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http://thinkexist.com/dictionary/meaning/ebonite/
A hard black material produced by heating rubber with sulphur. Used to simulate jet in jewellery and for some early fountain pens. Also know as vulcanite.
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http://www.antique-marks.com/antique-terms-e.html
See vulcanite.
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http://www.encyclo.co.uk/visitor-contributions.php
Eb'on·ite noun (Chemistry) 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.
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http://www.encyclo.co.uk/webster/E/4
Ebonite is a hard product obtained by fully vulcanising rubber with more than 20 percent of its weight of sulphur. Ebonite is very resistant to corrosion and as an excellent insulator was employed in the electrical industry.
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http://www.probertencyclopaedia.com/browse/GE.HTM
A hard, relatively inelastic compound produced by the vulcanisation of rubber and sulphur, commonly used as an electrical insulating material.
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https://www.encyclo.co.uk/local/20820
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