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The role of zinc stearate in the process of vulcanisation is:

1. to accelerate the process
2. to slow down the process
3. to stop the process
4. to initiate the process

Correct answer: to accelerate the process

Solution

Zinc stearate is used to speed up vulcanisation by helping the curing agents work more effectively. It does not initiate or stop the process; it mainly improves the rate of cross-linking.

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