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Gloss
is a subjective term used to describe the relative amount and
nature of mirror-like (specular) reflection. The amount of reflected
light increases with an increase of the illumination angle.
That is why it is easier to see imperfections say in auto body
repair when looking along side rather than straight on to the
vehicle. A glossmeter measures the specular reflection at a
fixed reflection angle. For paint and coatings, the angle is
generally assumed to be 60 ° unless otherwise stated.
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The
measurement results of a glossmeter are related to the amount
of reflected light from a standard. The measurement gloss value
for this defined standard is equal to 100 gloss units, frequently
shown as 100° gloss.
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Trade
practice recognizes the following stages in increasing order
of gloss but is not always consistent on the gloss measurements
of each stage.
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| Description
Flat
Eggshell or Low Gloss
Low Gloss or Satin
Semi-Gloss
High Gloss |
Gloss
@ 60 % Angle of Reflection
Less than 5 °
5 to 10 °
20 to 30°
35 to 65°
75° plus |
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| Note:
Final gloss on the painted substrate can be altered significantly
(15-20°) by 1 or more of the following factors: |
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1.
Texture of substrate.
2. Porosity of substrate.
3. Film build of paint.
4. Spray technique.
5. Reduction / Solvent addition.
6. Dry times
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