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Which of the following rubber cannot be vulcanised?

(a) BUNA – S

(b) BUNA – N

(c) Thiokol rubber

(d) Teflon

This question was addressed to me in class test.

This key question is from Synthetic Rubber topic in section High Polymers and Plastics of Applied Chemistry

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Right option is (c) Thiokol rubber

Easiest explanation: The Thiokol rubber is also called as the poly sulphide rubber. The Thiokol rubber cannot be vulcanised and it cannot form hard rubber.

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