Sa Rough—Areal Surface Roughness

Sa Rough – Areal Surface Roughness describes the average height variation of the surface over the full measured area, expressed in perceived microns (p‑µm) to reflect how roughness is seen in the Aesthetix texture image.

The calculation uses unfiltered topographical information from the full 3D height map, so all peaks and valleys in the measurement area contribute to the result rather than a smoothed or wavelength‑limited profile.

Lower Sa values indicate a smoother, more level surface, while higher values correspond to a rougher finish with more pronounced structure or texture.

Unit- Perceived Microns pµm