The ASTM D7897-18 (2023) standard specifies a laboratory test method for simulating the effects of natural exposure on the solar reflectivity and thermal emissivity of roofing materials. The standard is applicable to a wide range of roofing materials, including coatings, single-layer membranes, asphalt-modified products, shingles, ceramic tiles, and metal products. By simulating contaminant deposition, microbial growth, and environmental exposure, the method rapidly assesses the aging properties of materials in the natural environment. Its purpose is to provide a scientific basis for building design and material selection, helping to reduce building energy consumption and improve durability.