ASTM D 2240-15 (2021) is a standard test method for the determination of rubber Hardness. It is suitable for twelve types of equipment called hardness gauges, such as A, B, C, D, DO, E, M, O, OO, OOO, OOO-S, and Type R. These devices cover Hardness measurement of thermal plasticity resilience, vulcanized rubber, resilience materials, porous materials, gel-like materials, and certain plastics. This standard describes in detail the use of various hardness gauges, including measurement procedures and equipment requirements. However, this method is not applicable to the testing of coated fabrics. With ASTM D 2240-15 (2021), the Hardness characteristics of different materials can be effectively evaluated to ensure that the product mass meets the expected standards.