1. 1) JIS Z 2246: 2022, Shore hardness test – Test method (in Japanese).
2. 2) JIS B 7727: 2000, Shore hardness test – Verification of testing machine (in Japanese).
3. 3) ISO 16859-1: 2015, Metallic materials – Leeb hardness test – Part 1: Test method.
4. 4) JIS Z 2244-1: 2020, Vickers hardness test – Part 1: Test method (in Japanese).
5. 5) K.Matsuda: J. Jpn. Soc. Des. Eng., 54(2019), 791 (in Japanese).