GB/T 6031-1998 stipulates the determination method of vulcanized rubber or thermal plasticity rubber in the range of 10~ 100 IRHD Hardness. Hardness is an important performance index of rubber materials, which is related to its practical application performance. The standard specifies the requirements of various testing instruments, and details the operation steps, including sample preparation, test process specifications and reading methods. It also describes the calculation and representation of the results, providing a unified and scientific process for accurately obtaining rubber Hardness data. It helps rubber production, processing enterprises and related testing institutions to control the mass of products, rationally select and apply rubber materials, and improve the overall mass control level of the industry.