This standard specifies two methods for determining the indentation hardness of plastics and hard rubber using a Shore durometer. Depending on the softness or hardness of the material, either a Type A or Type D durometer should be selected for testing, with the former suitable for soft materials and the latter for hard materials. The method is simple to operate and provides intuitive readings, allowing for direct measurement of initial hardness using a handheld instrument or continuous readings over a specified period. The core instrument required for implementing this standard is the Shore durometer, which measures the depth of penetration of the indenter into the surface of the sample under a standard spring test force and converts it into a Shore hardness value, widely used in product quality control.