Befähigungsprüfung Vulkaniseur Practice Questions - Befähigungsprüfung Vulkaniseur (Austria) Exam

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Why is halobutyl rubber (chlorobutyl CIIR or bromobutyl BIIR) universally preferred over natural rubber for the innerliner (Dichtschicht) of modern tubeless pneumatic tires?

Halobutyl rubber has an extremely low gas permeability (air diffusion rate up to 10 times lower than NR) and superior flex-fatigue resistance, ensuring long-term tire pressure retention. Halobutyl rubber is completely transparent, allowing optical inspection of the tire carcass cord layers. Halobutyl rubber melts at 40°C to lubricate the tire bead during mounting. Halobutyl rubber expands when punctured to automatically seal all holes larger than 25 mm.

Correct Answer:

Halobutyl rubber has an extremely low gas permeability (air diffusion rate up to 10 times lower than NR) and superior flex-fatigue resistance, ensuring long-term tire pressure retention.

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