Or: 70 G.U., 50 G.U., matte
70 gloss level, 50 gloss level, matte

GU (or G.U.) = gloss units
It is the gloss level of the paint.

If the paint is not glossy, it is called matte. (艶無し)

Here are some websites:
http://www.johnsonspowdercoating.com/pc/index.htm
Semi Gloss Smooth Weather Resistant Polyester Powder Coatings are available in 7 Standard colors. Additional colors may be special ordered. Typical applications include hot galvanized parts, forgings, castings,fired clay or ceramics. Gloss level 50-70 Gardner. Film thickness can range from 2.5 to 3.5 mils.

http://www.gloss-meters.com/GlossIntro.html


http://www.cruisersforum.com/forums/f55/how-to-measure-the-g...
Gloss has been defined as the attribute of a surfaces that causes it to have a shiny or lustrous, metallic appearance.

The gloss of a surface can be greatly influenced by a number of factors, for example the smoothness achieved during polishing, the amount and type of coating applied or the quality of the substrate. Manufacturers design their products to have maximum appeal. Such examples are; highly reflective car body panels, glossy magazine covers or satin black designer furniture. Now what happens when products all of a sudden look different? Customers see this as a defect, or poor quality. Using a glossmeter and having good quality control practices eliminates this variable as a problem.

It is important therefore that gloss levels be consistent on every product or across different batches of products. Gloss can also be a measure of the quality of a surface, for instance a drop in the gloss of a coated surface may indicate problems with its cure- leading to other failures such as poor adhesion or lack of protection for the coated surface.

Gloss measurements depend on the gloss level. Gloss meters are either specific for the paint or multilevel ones.

If Semi Gloss - 10 to 70 GU Measurement Angle: 60 °
If High Gloss > 70 GU Measurement Angle: 20 °
If Low Gloss < 10 GU Measurement Angle: 85 °



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Note added at 3 days4 hrs (2010-09-27 08:37:39 GMT) Post-grading
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Hello, Ken. Thank you. But, points aside, I wish to say that you are one of the kindest, most polite and gentlemanly colleagues on ProZ. And, I do love your pic with Pikachu! :-)