GB/T 1232.2-2025 "Unvulcanized rubber, measured by disc shear Viscosity meter, Part 2: Determination of initial vulcanization characteristics" is an important test method standard in the field of rubber industry in our country. This standard replaces GB/T 1233-2008 and adopts the international standard ISO 289-2:2020 to comprehensively standardize the method of measuring the initial vulcanization characteristics of unvulcanized rubber by disc shear Viscosity meter. The standard is higher on the priority list of optimization of sample handling flow, test conditions and Data analysis methods, and adds technical details such as temperature control and sample filling, which significantly improves the accuracy and reproducibility of test results. As a key standard for rubber quality control, its implementation date is November 1, 2025, and it is managed by the National Rubber and Rubber Standardization Technical Committee.