ISO 8501-2 PDF

Order Information ISO In updated version of the standard measure for the visual evaluation of rust and purity levels of non-coated steel. Contains high-quality colour photographs for estimating the rust levels and purity levels after cleaning manually or by machine also with blasting. Target audience: Blasting and painting companies and their clients, paint technicians, advice bureaux and industrial coating businesses. ISO Purity levels of painted steel surfaces from which the paint layer has been weathered in places. Indispensable when repairing damage to corrosion-resistant paint systems and in the conservation or, for example, welding joints after construction. ISO Describes preparation grades of welds, cut edges and other areas, on steel surfaces with imperfections.

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This part of IS0 specifies a series of preparation grades for steel sur- faces after localized removal of previous paint coatings The various prep- aration grades are defined by written descriptions see clause 4 together with the representative photographic examples given in I S 0 This part of IS is applicable to sudaces prepared for painting by methods such as blast-cleaning, hand- and power-tool cleaning, and machine abrading.

This part of IS0 relates the cleanliness of a surface to its visual ap- pearance. In many instances this is sufficient, but for coatings likely to be exposed to severe environments, such as water immersion and continuous condensation conditions, consideration should be given to testing for soluble salts and other invisible contaminants on the visually clean surface by the physical and chemical methods which form the subjects of the various parts of IS0 The roughness characteristics of the surface should also be considered by reference t o I S 0 At the time of publication, the editions indicated were valid.

All standards are subject to revision, and parties to agreements based on this part of IS are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. IS0 , Paints and varnishes - Cross-cut test. IS0 , Paints and varnishes - Evaluation of the compatibility of a product with a surface to be painted - Methods of test.

IS0 , Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part I: General principles and rating schemes. IS0 , Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part 3: Designation of degree of rusting.

IS0 , Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part 4: Designation of degree of cracking. IS0 , Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part 5: Designation of degree of flaking.

IS0 , Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part 6: Rating of degree of chalking by tape method. IS0 , Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part I: Rust grades and preparation grades of uncoated steel substrates and steel substrates after overall removal of previous coatings. The preparation grades are defined see 4.

The letter P before Sa, St or Ma indicates only localized removal of previous paint coatings. The number following, if any, indicates the degree of cleaning from mill scale, rust and previous coatings. It should be realized that the various methods of cleaning do not give com- parable results. The degree of cleaning shall be compatible with the generic type of coating system to be used for recoating.

Reference is made in 4. Prior to blast-cleaning, any heavy layers of rust shall be removed by chip- ping. Visible oil, grease and dirt shall also be removed.

After blast-cleaning, loose dust and debris shall be cleaned from the surface. NOTE 5 For descriptions of surface preparation methods by blast-cleaning, including treatment prior to and after the blast-cleaning procedure, see I S 0 The surface of the other parts, when viewed without magnification, shall be free from visible oil, grease and dirt, from loose paint coatings and from most of the mill scale, rust and foreign matter.

Any residual contamination shall be firmly adhering see note 3 to 4. The choice depends on the degree of pitting. The surface of the other parts, when viewed without magnification, shall be free from visible oil, grease and dirt, from loose paint coatings and from mill scale, rust and foreign matter. Any remaining traces of contamination shall show only as slight stains in the form of spots or stripes. P Sa 3 Localized blast-cleaning to visually clean steel Firmly adhering paint coatings shall be intact.

It shall have a uniform metallic colour. NOTE 7 For descriptions of surface preparation methods by hand- and power-tool cleaning, including treatment prior to and afier the hand-powertool cleaning procedure, see IS0 P St 2 Thorough localized hand- and power-tool cleaning Firmly adhering paint coatings shall be intact. The surface of the other parts, when viewed without magnification, shall be free from visible oil, grease and dirt and from poorly adhering mill scale, rust, paint coatings and foreign matter see note 3 to 4.

P St 3 Very thorough localized hand- and power-tool cleaning As for P St 2, but the surfaces to be cleaned shall be treated much more thoroughly to give a metallic sheen arising from the metallic substrate. NOTES 8 Preparation grades P St 2 and P St 3 are not associated in any way with the use of particular hand- or power-tools, but are determined solely by the preparation grade definitions interpreted with the help of the representative photographic examples.

It comprises cleaning by thorough machine abrading for example by disc with abrasive paper or by special rotating wire brushes, which may be used in conjunction with needle guns. Prior to machine abrading, any heavy layers of rust shall be removed by chipping. After machine abrading, the surface shall be cleaned from loose dust and debris. The surface of the other parts, when viewed without magnification, shall be free from visible oil, grease and dirt, from loose paint coatings and foreign matter see note 2 to 4.

For comparison, photographs showing examples of preparation grade P Ma are appended t o this part of I S 0 NOTE 10 Preparation grade P Ma is not associated in any way with the use of particular tools, but is determined solely by the preparation grade definition, interpreted with the help of the representative photographic example. Existing sound coatings adjacent to abraded or blast-cleaned areas shall be bevelled feathered back to give sound and firmly adhering edges.

It is also imperative that subsequent coatings be compatible with the remaining coatings. Advice on assessing compatibility is given in IS0 For ease of manufacture, the plastic sheets on which the photographs have been reproduced do not carry page numbers. For convenience in use, the photographs are displayed in the order shown in figure 1.

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