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Gloss Measurements on Brushed Surfaces: Record the Direction
Directional texture can make appearance measurements dependent on instrument orientation. A comparison should state how the measurement direction relates to the surface pattern.
Updated · NANOLAB Knowledge
Practical approach
Mark a repeatable orientation and measure consistently. If direction is part of the question, report each orientation separately.
Rotating the instrument between visits on brushed metal can create an apparent change unrelated to the treatment being assessed.
Decision limits
Do not average opposing directions without explaining the method. Preserve the information needed to understand the observed appearance.
Related guidance
- Repeatability in Paint Thickness Measurements: Test the Operator
- Gloss Retention Calculations: Report the Baseline as Well as the Percentage
- Coating Roughness Measurements: Preserve the Filter and Evaluation Length
- Gloss Meter Calibration Tiles: Protect the Reference Surface
Method reference: BYK-Gardner: appearance and orange peel. References describe their stated methods or products; they do not certify NANOLAB products or establish compatibility with an unlisted surface.
Ask NANOLAB about the exact product and intended use. Use the current product documentation for formulation-specific instructions.
Continue reading
Repeatability in Paint Thickness Measurements: Test the Operator
Repeated readings help reveal whether measurement technique is stable. Do this before interpreting a small numerical change as material removed by polishing.
Gloss Retention Calculations: Report the Baseline as Well as the Percentage
Calculate gloss retention, preserve the initial and final readings, and avoid hiding baseline differences behind a percentage.
Coating Roughness Measurements: Preserve the Filter and Evaluation Length
Roughness results depend on how the measured profile is processed and evaluated. Method settings belong with the number.