ASTM D5081/D5081M-1990 (2018) Standard Test Method for Hiding Power of Aggregate Layers aims to provide a standardized test method for determining the hiding power of aggregate layers. This method is suitable for evaluating the ability of aggregates to cover the underlying material during laying, especially in Coating, road construction, and Miscellaneous material applications. Through this test, the covering performance of the aggregate layer can be accurately determined to ensure that it has an adequate covering effect in actual use, which in turn affects the service life and functional performance of the product. The standard provides a scientific basis for the quality control and design of materials, which helps to improve the construction mass and durability of aggregate materials.