Gloss units are also used in the painting industry to specify how glossy the final coating will be. There is an instrument specifically made for measuring the gloss, and calibration standards.What is a gloss unit?
Gloss is a measure of the amount of reflected light from a surface reaching the observer versus the amount of light scattered by the surface. It is usually measured by means of a Glossmeter that has a standardized light source and light sensitive receiving sensor. The standardized light source is transmitted onto the surface of the glass at a specified angle, normally 600 in the USA and 200 in Europe. A sensor placed at the same angle opposite the perpendicular to the source light then measures the light reflected from the surface. The Glossmeter then converts the results to ';Gloss Units';. Gloss units are based on standards developed by the manufacturers of the instruments and are not traceable to the National Institute of Standards and Technology (NIST). Many specifications are given with a particular manufacturer脥s name, such as ';Gardner Gloss Units.';
The lower the gloss unit number, the lower the glare and reflectivity of the glass surface. Non-glare glass is commercially available from approximately 45 gloss units to 140 gloss units. Due to the nature of processing, variations in the etch patterns will exist, both from sheet to sheet and within each sheet. Therefore, commercially produced non-glare glass will have a gloss unit tolerance specified.
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