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Activators are used in both sulfur and peroxide vulcanization. In peroxide vulcanization they are called coagents. The action of activators is to increase the effectiveness of cross-linking of vulcanizing units.
The most frequently used activator is zinc oxide, both in the case of sulfur vulcanization and sulfur donor vulcanization.
Zinc oxide, as a vulcanization activator, requires the presence of fatty acids that enable its transformation into a soluble form.
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