BS 3900-D5:1995 Methods of test for paints. Optical tests on paint films - Part D5. Measurement of specular gloss of non-metallic paint films at 20°, 60° and 85°
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This International Standard is one of a series of stardards dealing with the sampling and testing of paints, varnishes and related products.
I
t specifies a test method for determining the specular gloss of paint films using a reflectometer geometry of 20", 60" or 85*. The method is not suitable for the measurement of the gloss of metallic paints.
a) The 60* geometry is applicable to all paint films, but for very high gloss and near-matt films 20" or 85* may be more suitable,
b) The 20' geometry, which uses a smaller receptor aperture, is intended to give improved differen- tiation between high-gloss paint films (i.e. films with a 60" specular gloss higher than about 70 units).
c) The 85' geometry is intended to give improved differentiation between low-gloss paint films (i.e. films with a 60* specular gloss lower than about 10 units).
NOTES
1 The same geometry should, of course, be retained to a series of measurements even if this means disregarding the suggested limits.
2 In some cases, the determination of specular gloss may not correspond to a visual assessment.
BS 3900-D5:1995 Methods of test for paints. Optical tests on paint films - Part D5. Measurement of specular gloss of non-metallic paint films at 20°, 60° and 85°