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How much sulfur must be added to rubber for vulcanization?

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How much sulfur must be added to rubber for vulcanization?

(a) 1-5%

(b) 7-20%

(c) 25-35%

(d) > 40%

I have been asked this question in semester exam.

The origin of the question is Vulcanization and Forming of Rubber, Adhesion Process and their Types topic in portion Glass & Elastomers of Engineering Material & Metallurgy

1 Answer

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Best answer
Correct option is (a) 1-5%

Easiest explanation: The optimum quality of rubber is achieved when 1 to 5 parts of sulfur are added to 100 parts of rubber. The material becomes hard and less extensible when this proportion is increased.

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