Area Roughness Parameters

ISO 25178 Surface Texture Parameters Explained

Height
Spatial
Hybrid
Functional
Functional volume
Feature

Sv (Maximum pit height)

Vmc (Core material volume)

Sa (arithmetical mean height)

This parameter is the extension of Ra (arithmetical mean height of a line) to a surface. It expresses, as an absolute value, the difference in height of each point compared to the arithmetical mean of the surface. This parameter is used generally to evaluate surface roughness.

Search from the parameters list

Height	Sa (arithmetical mean height)
	Sz (Maximum height)
	Sq (Root mean square height)
	Ssk (Skewness)
	Sku (Kurtosis)
	Sp (Maximum peak height)
	Sv (Maximum pit height)
Spatial	Sal (Auto-correlation length) / Str (Texture aspect ratio)
Spatial	Std* (Texture direction)
Hybrid	Sdq (Root mean square gradient)
Hybrid	Sdr (Developed interfacial area ratio)
Functional	Smr(c) Areal material (bearing area) ratio
	Smc(mr) Inverse areal material ratio
	Sk (Core roughness depth)
	Spk (Reduced peak height)
	Svk (reduced dale height)
	Smr (Peak material portion)
	Smr2 (Valley material portion (percentage of the measurement area that comprises the deeper valley structures associated with Svk))
	Sxp (Peak extreme height)
Functional volume	Vvv (Dale void volume)
	Vvc (Core void volume)
	Vmp (Peak material volume)
	Vmc (Core material volume)
Feature	Spd (Density of peaks)
	Spc (Arithmetic mean peak curvature)
	S10z / S5p / S5v / Sda(c) / Sha(c) / Sdv(c) / Shv(c)

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