If your lab follows JIS K 6251, your results will generally be recognized in international markets.
Dumbbell specimens are the most common because they confine the highest stress concentration to a specific, measurable gauge length. Dumbbell Specimen Classifications
Note: The standard provides detailed formulas for correcting modulus values if slippage occurs at the grips. jis k 6251 pdf
Cut the rubber into the specified dumbbell shape using a die cutter.
While similar, these standards have slight differences in specimen dimensions and pulling speeds. JIS K 6251 is the preferred standard when working with Japanese manufacturers or for products entering the Japanese market. 1 and No. 3 as defined in the standard? If your lab follows JIS K 6251, your
The standard is essential for manufacturers, developers, and testing laboratories to ensure the consistency and reliability of rubber products. Current Standard Version
The standard was first established in 1993 and has undergone periodic revisions to align with industry advancements and international practices. The revision is based on , the globally recognized international standard for rubber tensile testing. Cut the rubber into the specified dumbbell shape
Used less frequently but allowed for specific applications where dumbbell cutting is impractical. Thickness: Generally between , measured precisely before the test. 4. Testing Procedure Conditioning: Samples must be kept at a controlled temperature (usually ) for at least 3 hours before testing.
| Feature | JIS K 6251 (Japan) | ISO 37 (International) | ASTM D412 (USA) | DIN 53504 (Germany) | | :--------------- | :----------------------------------------------------- | :----------------------------------------------------- | :--------------------------------------------------------- | :------------------------------------------------------ | | | Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties | Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties | Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers—Tension | Testing of rubber - Determination of tensile properties | | Test Speed | 500 mm/min (typically for No. 3 dumbbell) | 500 mm/min (typical) | 500 mm/min (typical) | 200 mm/min (varies by specimen type) | | Specimen Type | Primarily uses dumbbell specimens Nos. 1–6 | Primarily uses dumbbell specimens Types 1–4 | Primarily uses dumbbell specimens Die C | Uses dumbbell specimens S1, S2, S3A | | Harmonization | Technically aligned with ISO 37 (especially 2017 and later editions) | Serves as the international benchmark | Different specimen shapes and conditioning requirements | Different test speed and specimen shapes |
Your search for should end not with a shady download, but with a clear action plan. The official JIS K 6251:2017 is a vital document for any rubber testing laboratory, ensuring consistency with global standards like ISO 37.