Imported from the British SDC, also known as white cotton cloth, white muslin cloth, small white cloth, friction white cloth, small white cloth for color fastness. Use with ISO standard rubbing color fastness tester (instrument). After setting a certain number of back-and-forth rubbing under the dry/wet conditions required by the standard, use the ISO standard faded gray card & ISO standard stained gray card to evaluate its fading (discoloration) ) And staining grade, so as to evaluate its ability to color firm when the simulated cloth sample comes into contact with other substances. This standard friction cloth is widely used in Japanese standards (JIS), American standards, European standards and Chinese national standards, or used in adidas, NIKE, Li Ning standards.