Requires a tensile testing machine capable of a constant rate of traverse, often a "long-stroke" system to accommodate the high elasticity typical of rubber.
If the rubber breaks near the grip shoulder, the cutting die may be dull, or the specimen was misaligned in the machine.
Precision in equipment selection directly affects the accuracy of calculated tensile properties, including tensile strength (force at break divided by initial cross-sectional area) and elongation at break (total elongation at break as a percentage of initial length). jis k 6251 pdf
Testing typically follows general procedures for preparation, marking, and conditioning as specified in JIS K 6250 . Standard Evolution & PDF Availability
The standard, titled "Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties," is the definitive Japanese industrial guideline for evaluating the mechanical strength of rubber materials. Requires a tensile testing machine capable of a
Major global standards resellers provide downloadable licensed PDFs of the current revision.
JIS K 6251 is largely harmonized with ISO 37. JIS K 6251 is largely harmonized with ISO 37
JIS K 6251 is the definitive Japanese Industrial Standard for determining the tensile stress-strain properties
Executing a test according to JIS K 6251 requires a Universal Testing Machine (UTM) equipped with specific capabilities:
: Some institutions have extensive collections of standards, including JIS. University libraries, national libraries, or those specializing in engineering and materials science may have copies of JIS standards or be able to obtain them for you.
You can find the JIS K 6251 standard in PDF format through various sources:
