Imported from the United States, also known as small white cloth, friction white cloth, small white cloth for color fastness. It is equipped with a rubbing color fastness tester (instrument). Under the dry / wet conditions required by the standard, after setting a certain number of back and forth rubs, the fading (discoloration) and staining grades of the AATCC standard fading gray card &aatcc standard staining gray card &aatcc standard nine grade color card (ISO gray card is specified in some standards), so as to evaluate the ability of the simulated cloth to be firm in color when it contacts other substances. This standard friction cloth is widely used in Japanese standards (JIS), American standards, European standards and Chinese national standards, or in Adidas, Nike and Li Ning standards.