ASTM E490

ASTM E490 is a standard guide developed by the American Society for Testing and Materials for measuring the reflectance of solar radiation from surfaces. It helps define how to accurately assess how much sunlight a material or surface reflects, which is important for designing energy-efficient buildings, solar panels, and outdoor materials. The guide ensures consistent testing methods, so results are reliable and comparable across different studies and applications. Overall, it provides a standardized approach for evaluating the reflective properties of various surfaces to support sustainable and energy-conscious design.