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SIR WHAT DO YOU MEAN BY EBONITE
Ebonite is a type of resin that has a very long history. It is considered the first “synthetic resin” to become widely used.
In 1839, ebonite was invented by Mr. Charles Goodyear in the United States.
Ebonite is blackish brown and firm, but its main raw material is rubber. By mixing and heating rubber and sulfur, they combine and become low-elastic and very firm vulcanized rubber with an elongation percentage of approximately 3%.

This is what ebonite is.

The name “ebonite” comes from the meaning “ebony.”
Ebonite is black-colored, elastic horn-like material, and a crack in ebonite is glossy. It is clear brownish-red in thin-film form and brownish-red in powdered form.
Ebonite is sometimes called “hard rubber.” But we distinguish with hard rubber that is hardened with fillers.
Ebonite is durable, scientifically stable and provides excellent electrical insulation and machinability. Before the rise of petroleum-derived plastic, ebonite was widely used in every aspect of life.

Insulation properties
  1.   Very high insulation properties.
  2.   All hydrocarbon polymers have insulation properties.
  3.   Especially, ebonite provides excellent insulation performance.
High-frequency dielectric loss
  1.   Extremely low.
  2.   Perfect for wired lines as much as wireless.
Aging resistance
  1.   Provides extremely high resistance especially against ultraviolet rays.
Free sulfur
  1.   Extremely low free sulfur. Contacting parts with metal also provide low      sulfurization.
Acid resistance, alkaline resistance
  1.   Provides excellent resistance against chemicals, including acid and alkali, at room temperature.
Mechanical strength
  1.   Has hardness and strength comparable to metal.
Appearance and workability
  1.   Gives dark shiny gloss when polished. Easy to conduct a precision work and forming.
Water absorbability
  1.   Water absorbability is extremely low compared to soft rubber.
  2.   Very high moisture resistance.
  3.   Therefore, there is no rapid reduction in insulation properties when moisture is absorbed.


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