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". |
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