Understanding Gloss Unit and Paint Gloss Meter

To detect the surface gloss of an object, a paint gloss meter can be used. Many customers who use a paint gloss meter are asking what is the gloss unit? We usually say that the length is in units of meters, centimeters and the weight is in kilograms and grams. What is the unit of gloss as an indicator of the work piece surface gloss?

According to the description of "JJG696-2002 Specular Gloss Meter and Gloss Plate", "Specular gloss is a relative measurement of gloss, with reference to black glass with refractive index nD=1.567, assuming that its plane is ideally polished, the natural light beam is specular-reflected by this plane. The gloss value at this time is defined as 100.0 gloss units. The symbol of the specular gloss is Gs (θ), the unit is the gloss unit, where θ is the measured light. The angle of incidence, such as: 60 °. Therefore, the international convention symbol is GU, which is the acronym for the gloss unit.

According to the Japanese Industrial JIS standard, the gloss unit can be written as a percent sign, such as 40 GU gloss can be written as 40%, or directly expressed as a number. In China, generally we will hear how much gloss is detected by a paint gloss meter. This statement is not wrong, because "gloss" is the same as "temperature, angle" unit, because there is a word "degree". Therefore, the Chinese are accustomed to call how many degrees of gloss. For example, the value detected by the paint gloss meter is 50 degrees, we can understand that the gloss is 50Gu or 50%.

In industrial production, when writing the gloss value, it is generally necessary to add an angle label.