The rigidity of vulcanized rubber is directly proportional to the percentage of sulphur added. What percentage of sulphur is typically used to manufacture the extremely hard, non-elastic material know

Question

The rigidity of vulcanized rubber is directly proportional to the percentage of sulphur added. What percentage of sulphur is typically used to manufacture the extremely hard, non-elastic material known as Ebonite?

Prashant Kotian · Accepted Answer

Correct answer: D. Standard tyre rubber uses ~5% sulphur, and battery casings use ~30%. The massive cross-linking required to produce hard, completely rigid Ebonite requires between 40% to 45% sulphur.

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