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16
Practical measuring suggestions
In accordance with the standard,
the reflectometer value is related to
a black glass standard at a defined
index of refraction (generally 1.567)
which is thus equal to 100 units.
Reflectometers are differentiated by
the angle of incidence of the
illuminating mechanism.
Geometries are set in the standards
at 20°, 60° and 85°.
50
Paints and varnishes, plastics
and similar materials
The various geometries are
distinguished according to their
fields of application as follows:
Semi-gloss surfaces are measured
at an angle of incidence of 60° and
should fall within a range from 10 to
70 gloss units.
Highly reflective surfaces with
measurement values exceeding 70
units in the 60° geometry should be
measured at 20°.
On the other hand, matte surfaces
with less than 10 gloss units (at 60°)
should be measured at the 85°
geometry.
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