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Gloss Units. A perfectly reflecting, theoretically flat mirror would reflect all directed light and have a value of about GU, but in practical applications, the scale ranges from (completely matte) to Gloss Units.
A car door and hood might come from different factories. Using ASTM D523, both plants set their 20° gloss meters to the same reference standard. The result? Perfect color-and-gloss match. astm d523 pdf new
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The testing process outlined in the ASTM D523 PDF relies on a highly standardized optical system. Core Components of a Gloss Meter This public link is valid for 7 days
Matching the gloss levels of exterior body panels, interior plastic dashboards, and trim components.
Formulating architectural paints, industrial coatings, and powder finishes. Can’t copy the link right now
Comprehensive Guide to ASTM D523: Understanding and Accessing the Specular Gloss Standard
Turn on the gloss meter and allow it to stabilize if required by the manufacturer.
If the initial reading at 60° falls between 10 GU and 70 GU (Gloss Units), the 60° geometry is the correct angle to record. 2. The 20° Geometry (High Gloss) Target Range: High-gloss surfaces.