The width and thickness of the specimen are measured at multiple points.
The official, current version of the standard is , which replaces older revisions such as JIS K 6251:2017 and JIS K 6251:2010. This guide serves as a comprehensive overview of what the document covers, its testing parameters, and how to source an official PDF copy. What is JIS K 6251? jis k 6251 pdf
The standard is a foundational Japanese Industrial Standard that specifies the test methods for evaluating the tensile stress-strain properties of vulcanized and thermoplastic rubbers . Established by the Japanese Standards Association (JSA) , this standard serves as a critical methodology for automotive, manufacturing, and aerospace engineering industries. The width and thickness of the specimen are
The specimen is mounted, ensuring it is centered. Testing: The machine extends the specimen until it breaks. What is JIS K 6251
| Feature | JIS K 6251 (Japan) | ISO 37 (Intl) | ASTM D412 (USA) | | :--- | :--- | :--- | :--- | | | Dumbbell Type 1, 2, 3 | Dumbbell Type 1, 2, 3 | Dumbbell Type C, D, etc. | | Test Speed | 500 mm/min (Standard) | 500 mm/min | 500 mm/min (Common) | | Die Dimensions | Harmonized with ISO | Standard | Slightly different die profiles | | Calculation | Force / Original Cross-Section | Force / Original Cross-Section | Force / Original Cross-Section |
The JIS K 6251 standard is important for several reasons:
The day of the Great Tensile Test arrived. The lab technician, Hiroshi, carefully clamped Dumbbell No. 3 into the grips of a Shimadzu Autograph . According to the protocol, Hiroshi ensured the environment was perfectly conditioned—neither too hot nor too cold, as rubber is quite moody about its temperature.