No. Tear strength is covered under JIS K 6252 (Rubber, vulcanized or thermoplastic – Determination of tear strength). Do not confuse the two.
| Feature | JIS K 6251 | ISO 37 | ASTM D412 | |---------|------------|--------|-----------| | | Japan | International | USA | | Test piece shapes | Dumbbell (Types 1-4), Ring | Dumbbell (Types 1, 2, 3), Ring | Dumbbell (C & D), Ring | | Test speed (Dumbbell) | 500 ± 50 mm/min | 500 ± 50 mm/min | 500 ± 50 mm/min (Die C) | | Thickness measurement | At three points | At three points | At three points | | Temperature | 23 ± 2°C | 23 ± 2°C | 23 ± 2°C | | Correlation | Highly similar to ISO 37 | Largely interchangeable with JIS | Slightly different die geometry |
: Samples must be conditioned according to ISO 23529 guidelines to ensure temperature and humidity do not skew results. Testing Apparatus and Procedure
The Japanese Industrial Standard (JIS) K 6251 is a widely recognized specification for rubber products, outlining the requirements for the physical properties, testing methods, and quality control of various rubber materials. In this article, we will provide an overview of JIS K 6251, its significance, and the importance of having access to the PDF version of this standard.
The official PDF from JSA is text-searchable (not just scanned). This makes it easy to find terms like "Type 2 dumbbell" or "500 mm/min."