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.
The speed at which the testing machine pulls the specimen apart directly alters the results due to the viscoelastic nature of rubber. JIS K 6251 defines standard testing speeds, commonly
Several distributors also sell JIS K 6251 PDFs:
The standard specifies multiple shapes, most commonly dumbbell-shaped (Nos. 1 through 6) or ring-shaped test pieces. jis k 6251 pdf
The standard demands that you calculate tensile strength by dividing the maximum force by the of the narrow portion. You need a thickness gauge accurate to 0.01mm.
The primary goal of the standard is to define how rubber materials react when stretched to the point of failure. The key metrics determined through this test include: Tensile Strength: The maximum stress a material can endure before breaking. Elongation at Break:
If you only need general rubber tensile testing, ISO 37 is nearly identical (Japan adopted ISO 37 with minor editorial changes as JIS K 6251). ISO 37 PDFs are often easier to purchase legally via national standards bodies. Requires a tensile testing machine capable of a
This comprehensive guide breaks down the technical core of the standard, its global equivalents, and how to safely navigate looking for a . What is JIS K 6251?
JIS K 6251 is developed and maintained by the under the framework of Japan's Industrial Standardization Law. The standard is published by the Japanese Standards Association (JSA) and is administered through the Japan Rubber Manufacturers Association (JRMA). Because this is a Japanese industrial standard, many official publications are available in both Japanese (和文) and English translation (英訳) formats.
Executing a JIS K 6251 compliant test requires precision laboratory equipment and specific environmental controls. 1. Environmental Conditioning 1 through 6) or ring-shaped test pieces
Secure the specimen in the grips and pull at the specified speed (typically for standard dumbbells).
Minor variations may exist in specimen dimensions and pulling speeds, so always verify the specific version required by your client. 📂 Why You Need the Official PDF
Whether you are sourcing automotive seals, consumer electronics gaskets, or industrial hoses, understanding this standard ensures compliance, quality, and component longevity. What is JIS K 6251?