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18. May 2021
© Copyright 2021, PROCEQ SA
18
7 How to choose the correct measuring geometry in the area of
paint industry
The following explanations apply to smooth coated surfaces, they do not fully apply for
metallic and textured coatings or uneven surfaces. They do not apply at all for other surfaces
such as foils, metals, textiles and paper.
According to the standard ISO 2813 and ASTM D523 the correct measuring geometry should
be determined by a pre - measurement taken at 60°. Related to that the correct measuring
geometry can be determined with the table below.
ISO 2813
ASTM D523
Value @ 60°
Geometry
>70 GU
20°
10 GU
–
70 GU
60°
<10 GU
85°
Value @ 60°
Geometry
>70 GU
20°
10 GU
–
70 GU
60°
<10 GU
85°
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