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.
of rubber. It is the primary benchmark used by manufacturers in Japan and international partners to ensure rubber components (like seals, hoses, and tires) can withstand mechanical stretching without failing. 2. Key Measurements Defined The standard focuses on four critical metrics: Tensile Strength ( cap T cap S jis k 6251 pdf