Paints and Varnishes - Determination of Specular Gloss of Non-Metallic Paint Films at 20 Degrees, 60 Degrees and 85 Degrees
|Publication Date:||1 August 1994|
|ICS Code (Paints and varnishes):||87.040|
This International Standard is one of a series of standards dealing with the sampling and testing of paints, varnishes and related products.
It 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 differentiation 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).
1 The same geometry should, of course, be retained for 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.