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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°
