Astm D523 Pdf New |work| Jun 2026

The procedure for measuring specular gloss involves:

The ASTM D523 test method defines three key angles to evaluate gloss based on the expected surface reflectivity: Application 60∘60 raised to the composed with power

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The standard is the primary method for measuring the specular gloss of nonmetallic specimens using three specific light-reflectance angles: 20° , 60° , and 85° . It is widely used in industries like coatings , plastics, and manufacturing to ensure visual consistency and surface quality. Core Content Outline for ASTM D523 ASTM D523: Specular Gloss Test Method | PDF - Scribd

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Significant clarification has been added regarding the use of a flat surface. The new PDF stresses that sample curvature greater than a defined radius invalidates the test. The procedure for measuring specular gloss involves: The

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The general calibration workflow involves first zeroing the instrument to eliminate ambient light interference (often using a black cavity), followed by calibrating against a reference standard. The primary reference is a highly polished black glass with a refractive index of 1.567, which is defined to have a gloss value of 100 GU. If you share with third parties, their policies apply

The reading wasn't 92 GU. It was 68 GU.

The standard defines three specific geometries for measurement: , each serving a distinct purpose.

If the 60° gloss value is greater than 70 GU (indicating a highly reflective, high-gloss surface), the standard recommends using the 20° geometry. This angle is more sensitive to small differences in gloss on high-gloss surfaces, which often appear too similar when measured at 60°, making it the standard for evaluating high-gloss paints, polished metals (non-metallic coatings), and glossy plastics.