Jis K 6253-3 [new]

Because Japan is a global leader in automotive, electronics, and precision machinery, JIS K 6253-3 appears in thousands of material specifications.

The standard specifies a method for determining the of vulcanized or thermoplastic rubber. Unlike the Shore A method (covered in Part 1), IRH provides a hardness scale that correlates more directly with the elastic modulus of the material, making it highly suitable for comparative testing across different types of rubber, especially softer compounds. jis k 6253-3

| Feature | Type A | Type D | |---------|--------|--------| | | Truncated cone (35° angle, 0.79 mm tip diameter) | 30° conical with 0.1 mm radius tip | | Spring force | 0.55 N to 8.05 N (0–100 scale) | 0.55 N to 44.5 N (0–100 scale) | | Typical use | Soft elastomers (20–90 A) | Hard rubbers (above 90 A) and plastics | | Pressure foot | 18 mm ± 0.5 mm diameter | 18 mm ± 0.5 mm diameter | Because Japan is a global leader in automotive,

To understand Part 3, one must first understand the parent standard. JIS K 6253 is the Japanese Industrial Standard (JIS) titled "Rubber, vulcanized or thermoplastic — Determination of hardness." | Feature | Type A | Type D