This standard specifies a test method for measurement of powder coatings hiding power. Hiding power refers to the ability of coatings to cover the surface of substrates, affecting the appearance and protective effect of coatings. The standard evaluates the covering ability of powder coatings at different thicknesses through precise experimental methods to ensure that they meet mass requirements. The standard describes in detail the test equipment, operation procedures, test conditions and data processing methods, providing a scientific basis for the quality control and performance evaluation of powder coatings.