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# Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 4: Method for the calibration of ISO surface profile comparators and for the determination of surface profile — Stylus instrument procedure

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This part of ISO 8503 specifies the stylus instrument and describes the procedure for calibrating ISO surface profile comparators conforming to the requirements of ISO 8503‑1.

This part of ISO 8503 is also applicable to the determination of the surface profile, within the range Ry5 = 20 μm to Ry5 = 200 μm, of essentially planar blast-cleaned steel. The determination can be carried out on a representative section of the blast-cleaned surface or, if direct observation of the surface is not feasible, on a replica of the surface.

NOTE Where appropriate, this procedure can be used to assess the roughness profile of other abrasive blast-cleaned substrates.

An alternative procedure is described in ISO 8503‑3.