Shiny surfaces lose their gloss due to sunlight, heat and moisture.


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Gloss is one of the parameters most often measured in weathering tests of materials and products. This particularly includes paints and coatings for architectural, transportation, and consumer products and other high gloss finishes.

This guide will serve as a brief introduction to specifying and understanding basic gloss measurements used in weathering. While we are generally concerned with a loss of gloss during degradation, an increase in gloss can also be important, such as for an automotive instrument panel where glare can present a safety hazard.

In this Technical Guide you learn about:

  • Specular reflection, scattering, incidence angle
  • Gloss units (GU)
  • Gloss retention in weathering
  • Gloss measurement