Frequently Asked Questions About Gloss
Many industries have adopted the 20/60/85º geometries as specified in ISO2813/ ASTM D523, however consult the table below for more information on specific industries and their industrial standards.
The measurement scale, Gloss Units (GU), of gloss meters is a scaling based on a highly polished reference black glass standard with a defined refractive index having a specular reflectance of 100GU at the specified angle.
If two different coatings are measured, what number of gloss units would be detectable by the human eye, how many units would be perceived as significantly different?
As well as calibrating your glossmeter on its own reference gloss tile before use, your glossmeter and its tile need to be calibrated yearly by a Rhopoint Approved Service Agent.
It can be problematic to measure the gloss of flat transparent material such as glass and plastics because light is reflected from both the front surface and internally from the second surface