GB/T 25811-2010 "Standard Bleached Polyester Fabric for Dye Testing" specifies the technical requirements and specifications for standard bleached polyester fabric used exclusively in dye testing, applicable to various dye testing scenarios. The standard stipulates that the fabric surface must be uniformly smooth and free of defects, with indicators such as width, warp and weft density, pH of aqueous extract, and whiteness required to fall within specific ranges. There are strict limitations on the color difference between batches and variations in color depth. Testing requires instruments such as a whiteness meter, pH meter, and fabric density meter, providing fundamental assurance for the accuracy and comparability of dye testing results.