Befähigungsprüfung Vulkaniseur Practice Questions - Befähigungsprüfung Vulkaniseur (Austria) Exam

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What is the phenomenon of 'Reversion' observed in natural rubber (NR) compounds during prolonged exposure to high vulcanization temperatures?

Thermal degradation and cleavage of polysulfidic cross-links into cyclic sulfides and shorter mono-sulfidic bonds, resulting in a noticeable drop in rheometer torque, modulus, and tensile strength. The complete conversion of rubber back into raw latex sap. The instant explosion of the vulcanization curing envelope. The permanent hardening of rubber into brittle glass.

Correct Answer:

Thermal degradation and cleavage of polysulfidic cross-links into cyclic sulfides and shorter mono-sulfidic bonds, resulting in a noticeable drop in rheometer torque, modulus, and tensile strength.

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