Befähigungsprüfung Vulkaniseur Practice Questions - Befähigungsprüfung Vulkaniseur (Austria) Exam

On an oscillating disk or moving die rheometer (MDR) vulcanization curve, what does the parameter t_90 represent?

The optimum cure time required for the rubber compound to reach 90% of its maximum cross-linking torque (cure state). The scorch time (Anvulkanisationszeit) when the rubber compound begins to harden in the mold. The minimum viscosity time when the compound is fully liquid. The total time required for 90% of the sulfur to evaporate.

Correct Answer:

The optimum cure time required for the rubber compound to reach 90% of its maximum cross-linking torque (cure state).

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