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: The maximum stress a material withstands before rupture.

Rubber is viscoelastic, meaning its behavior changes depending on how fast it is pulled. JIS K 6251 specifies the speed at which the testing machine must separate its grips (typically 500 mm/min or 200 mm/min) to ensure consistent data.

Tensile testing is fundamental to the rubber industry. It ensures that rubber components—such as automotive seals, gaskets, O-rings, and conveyor belts—can withstand mechanical forces during their operational lifespan. Core Materials and Parameters Measured