Measurements are performed using a calibrated . The device shines a beam of light at one of the specified angles and measures the intensity of the reflected light with a photo detector. D523 Standard Test Method for Specular Gloss - ASTM
Standardized gloss measurement is critical for maintaining quality across global supply chains in industries like automotive, aerospace, and consumer electronics. Core Measurement Geometries
Comprehensive Guide to the ASTM D523-25 Standard for Specular Gloss astm d523 pdf new
Applied to "sheen" or matte surfaces that measure below 10 GU at the 60° angle. This grazing angle is more sensitive to differences in low-gloss textures. How Specular Gloss is Measured
Used for surfaces that measure above 70 Gloss Units (GU) at the 60° angle. This geometry provides better resolution for very shiny coatings. Measurements are performed using a calibrated
The latest version of the primary international standard for measuring surface shininess is , approved in June 2025 . This standard defines a rigorous methodology for quantifying "specular gloss"—the ability of a nonmetallic surface to reflect light in a mirror-like direction.
The standard specifies three primary measurement angles (geometries) to ensure accuracy across different levels of shininess: Core Measurement Geometries Comprehensive Guide to the ASTM
The standard starting point for all finishes. It is used to categorize a surface before more specialized testing.