GB/T 7568.5-2002 Specifications for polypropylene (PP) nitrile standard lining fabrics in the colour fastness test of Spinning & weaving products. It specifies the fiber characteristics of such lining fabrics, yarn details, such as thread density, twist, etc., as well as the requirements of fabric structure, density, Appearance quality, etc. These detailed specifications ensure that the polypropylene (PP) nitrile standard lining fabric performance is stable and consistent in the colour fastness test, so that the colour fastness results obtained in different test environments can be compared with each other, providing reliable support for the Spinning & weaving industry to accurately determine the colour fastness of Spinning & weaving products, and promoting the standardization of mass inspection processes.