hard rubber, vulcanite, ebonite(noun)
a hard nonresilient rubber formed by vulcanizing natural rubber
The relatively hard product of vulcanizing natural rubber with sulfur; vulcanite
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
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 now refers to the mineral vulcanite.
The Standard Electrical Dictionary
Hard vulcanized India rubber, black in color. Specific resistance in ohms per cubic centimeter at 46º C. (115º F.): 34E15 (Ayrton); specific inductive capacity, (air = 1): 2.56 (Wüllner); 2.76 (Schiller); 3.15 (Boltzmann). It is used in electrical apparatus for supporting members such as pillars, and is an excellent material for frictional generation of potential. Its black color gives it its name, and is sometimes made a point of distinction from Vulcanite, q. v.
The numerical value of ebonite in Chaldean Numerology is: 2
The numerical value of ebonite in Pythagorean Numerology is: 7
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