Gardner Gloss - ASTM D523 Plastic Test Standard

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Gardner Gloss - ASTM D523

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Gloss is a measure of how shiny, or reflective a material is at a specified angle based on refractive index.

An incandescent light source is directed at the test specimen at a specified incidence angle. A receptor is located at the mirror reflection of the incident beam. Polished black glass with a refractive index of 1.567 is used as a standard and is assigned a gloss of 100 at all geometries. Measurements are made using a glossmeter.

Gardner Gloss Measurement

Gloss Geometries
Angle	Use	Note
20°	Good for comparing specimens having 60° gloss values higher than 70.	Equivalent to ASTM D2457 at 20°.
60°	Comparing specimens and determining when 20° gloss is more applicable.	Equivalent to ASTM D2457 at 60°.
85°	Good for comparing specimens for sheen. Most often used when specimens have 60° gloss values lower than 10.	Commonly known as "Sheen".

Similar Standards

ASTM D2457

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