GB/T 8440-1998 is a test standard for the colour fastness of Spinning & weaving products against carbonization of sulfuric acid. This standard clearly defines the method for testing the colour fastness of Spinning & weaving products under the condition of carbonization of sulfuric acid, covering the preparation requirements of sulfuric acid solution, the specific operation process of carbonization treatment, including key links such as temperature and duration control, and the system result evaluation method. Testing according to this standard can accurately judge the Color Stability of Spinning & weaving products after carbonization of sulfuric acid, providing an important reference for Spinning & weaving enterprises to optimize production processes and ensure product mass, and helping to improve the quality of Spinning & weaving products under related processes.