SaluTron Messtechnik

Gloss measuring gauges

For precise and fast gloss measurement

The gloss meter is also called a reflectometer. It uses a light source and a lens to project parallel light onto surfaces. The receiver, consisting of a lens, aperture, and photo receiver, captures the light reflected from the surface and determines its reflection degree by illuminating the sample surface at the same angle.

Gloss defines the optical property of a surface with the ability to reflect light. When a light beam hits, for example, a layer of paint at a defined angle of incidence, most of the beam penetrates, while a certain part is reflected back. The resulting results in gloss measurement are not given in percentage but in 0 to 100 gloss units (GU).

The so-called reflectometer value refers to a polished, black glass standard and not to the amount of light irradiated. This standard has a defined refractive index of 1.567 and is set equal to 100 gloss units (GU). Mirrors, polished metal, and certain foils have a much higher refractive index than paints or the black glass standard used for calibration. With these products, immensely higher gloss values (up to 2,000 GU) can be determined using a gloss meter.

In the industry, the appearance in the form of mattness or gloss is often a decisive quality factor for products. The gloss meter is particularly used in paper manufacturing, the automotive industry, dishware manufacturing, and paint shops.

Consider the measurement geometry when selecting a gloss meter

Before purchasing your new gloss meter, you should be clear about the following things:

  • What samples are mainly measured? Depending on the type of surface, certain measurement geometries or angles must be considered, which are crucial for accurate work.
  • Are the samples predominantly matt or glossy? This way, you can determine the number of required measurement angles. For cross-industry samples or different materials, multi-angle measuring devices are needed.
  • Where should the measurement take place? To get information about aids, especially holders for small and precise measurement spots and the question of a fixed or portable measuring device, the location of the measurement plays a crucial role.

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