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Gardner Gloss - ASTM D523
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
| 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". |