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It has been assumed in the drafting of this standard that it will be used and applied by those who are suitably qualified and experienced and for whose guidance it has been prepared. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, the EN ISO title page, pages 2 to 8, an inside back cover and a back cover.
This standard has been updated see copyright date and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.
This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November , and conflicting national standards shall be withdrawn at the latest by November Contents Foreword 0 Introduction 1 Scope and field of application 2 References 3 Definitions 4 ISO surface profile comparators 5 Ranges of the profile gradings 6 Calibration of comparators 7 Maintenance and re-calibration of comparators 8 Calibration certificate for ISO surface profile comparators Annex A Recommendations regarding the care of ISO surface profile comparators Annex ZA normative Normative references to international publications with their relevant European publications Figure — ISO surface profile comparator Table 1 — Nominal values and tolerances for the surface profiles of the segments of ISO surface profile comparators Table 2 — Limits of profile grades Page 2 3 3 4 4 5 6 6 6 6 8 8 7 5 6 2?
The principal factors that are known to influence this performance are a the presence of rust and mill scale; b the presence of surface contaminants, including salts, dust, oils and greases; c the surface profile. International Standards ISO , ISO and ISO have been prepared to provide methods of assessing these factors, while ISO provides guidance on the preparation methods that are available for cleaning steel substrates, indicating the capabilities of each in attaining specified levels of cleanliness.
These International Standards do not contain recommendations for the protective coating systems to be applied to the steel surface. Neither do they contain recommendations for the surface quality requirements for specific situations even though surface quality can have a direct influence on the choice of protective coating to be applied and on its performance.
Such recommendations are found in other documents such as national standards and codes of practice. It will be necessary for the users of these International Standards to ensure that the qualities specified are — compatible and appropriate both for the environmental conditions to which the steel will be exposed and for the protective coating system to be used; — within the capability of the cleaning procedure specified.
The four International Standards referred to above deal with the following aspects of preparation of steel substrates: ISO , Visual assessment of surface cleanliness. ISO , Tests for the assessment of surface cleanliness. ISO , Surface roughness characteristics of blast-cleaned steel substrates. ISO , Surface preparation methods.
Each of these International Standards is in turn divided into separate parts. Irrespective of the procedures and the type of abrasive that are used for the preparation of steel substrates, the surface after blast-cleaning consists of random irregularities with peaks and valleys that are not easily characterized.
Consequently, it was concluded that, because of this random nature, no method is capable of giving a precise value for the profile. These surface characteristics are considered to give sufficient distinguishing features for most painting requirements. ISO describes the method of using these comparators. The many abrasive blast-cleaning procedures in common use are described in ISO ISO surface profile comparators are for use in assessing, on site, the roughness of surfaces before the application of paints and related products or other protective treatments.
ISO , Paints and varnishes — Vocabulary. ISO , Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings. ISO , Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 2: Method for the grading of surface profile of abrasive blast-cleaned steel — Comparator procedure — Part 3: Method for the calibration of ISO surface profile comparators and for the determination of surface profile — Focusing microscope procedure — Part 4: Method for the calibration of ISO surface profile comparators and for the determination of surface profile — Stylus instrument procedure.
ISO , Preparation of steel substrates before application of paints and related products — Surface preparation methods — Part 2: Abrasive blast-cleaning2. Characteristics of the roughness of blast-cleaned surfaces are defined in 3. ISO surface profile comparators shall be manufactured by forming positive replicas from nickel or other corrosion-resistant metal using master coupons prepared from mild steel for example, electro-forming has been found to give suitable products.
Table 1 — Nominal values and tolerances for the surface profiles of the segments of ISO surface profile comparators a Comparators for steel, blast-cleaned with grit abrasives Segment Nominal readinga 4m Tolerance 4m 3.
When using the stylus method see ISO , the nominal reading refers to R y5. The segments shall comply with the values given in Table 1 when measured according to the methods described in ISO or ISO The visual assessment of the comparator shall not be inferior to preparation grade Sa 2 " of ISO Each comparator shall be accompanied by a calibration certificate stating the method for determining the surface profile, the estimated tolerance, and the calibrated surface profile, in micrometres, of each segment see also clause 8.
NOTE Other comparator designs and configurations may be used, provided that four segments are included which comply with the profiles and tolerances specified in this International Standard. Table 2 — Limits of profile grades a Comparators for steel, blast-cleaned with grit abrasives Fine G Medium G Coarse G Profiles equal to segment 1 and up to but excluding segment 2 Profiles equal to segment 2 and up to but excluding segment 3 Profiles equal to segment 3 and up to but excluding segment 4 6 Calibration of comparators A comparator shall be deemed to have been calibrated if, on measuring each of the profiles on the reference surface by either the method described in ISO or the method described in ISO , the values for all the profiles are within the respective nominal values and tolerances specified in Table 1.
Only surface profile comparators that comply may be inscribed on the underside as described in clause 4. If the visual assessment of the cleanliness of the surface of the comparator does not correspond to Sa 2 " or Sa 3 specified in ISO , the comparator shall be discarded.
Comparators require careful handling. If any noticeable wear is detected, the comparator shall be discarded or, if appropriate, re-calibrated. NOTE Comparators in frequent use should be checked against an unused comparator at three-monthly intervals or whenever the surface appears worn or damaged. If a segment of a used comparator, when compared with the equivalent segment of an unused comparator, would yield a different grading assessment see ISO of a surface profile, the used comparator should be discarded or re-calibrated.
Keep the comparator in the protective case provided when not in use. Never place the comparator face down on rough surfaces despite the protection strips. If the comparator becomes wet, dry it with soft tissues. Annex ZA normative Normative references to international publications with their relevant European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter.
For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. Publication Year Title EN Year ISO Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 2: Method for the grading of surface profile of abrasive blast-cleaned steel — Comparator procedure Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 3: Method for the calibration of ISO surface profile comparators and for the determination of surface profile — Focusing microscope procedure 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 EN ISO ISO EN ISO ISO EN ISO 8?
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BS EN ISO 8503-1:2012