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What is the percentage of elongation of styrene butadiene?

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What is the percentage of elongation of styrene butadiene?

(a) 450-500%

(b) 400-600%

(c) 500-700%

(d) 800%

This question was addressed to me by my college director while I was bunking the class.

Question is taken from Types of Rubbers in chapter Glass & Elastomers of Engineering Material & Metallurgy

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The correct answer is (a) 450-500%

To elaborate: Styrene butadiene refers to a high abrasion resistant rubber composed of styrene and butadiene. These rubbers go by the common name of Buna S or SBR (styrene butadiene rubber). The percentage of elongation of SBR is 450-500%.

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