ISO 8504-3:2018 pdf download.Preparation of steel substrates before application of paints and related products Surface preparation methods Part 3: Hand- and power-tool cleaning.
The performance of protective coatings of paint and related products applied to steel is significantly affected by the state of the steel surface immediately prior to painting. 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.
Iso 8501 and ISO 8502 have been prepared to provide methods of assessing these factors, while ISO 8504 provides guidance on the preparation methods that are available for cleaning steel substrates, indicating the capabilities of each in attaining specified levels of cleanliness.
ISO 8504-3 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. The users of ISO 8504-3 should ensure that the qualities specified are:
— compatible with and appropriate both for the environmental conditions to which the steel will be
ISO 8504-3 describes methods for hand-tool and power-tool cleaning of steel substrates before application of paints and related products. It is applicable both to new steelwork and to steel surfaces that have been coated previously and that show areas of breakdown requiring maintenance painting. It describes the equipment to be used and the procedures to be followed.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 8501-1, Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoa ted steel substrates and of steel substrates after overall removal of previous coatings
ISO 850 1-2, Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 2: Preparation grades of previously coated steel substrates after localized removal of vrevious coatinas
3.3
water, solvent or chemical cleaning
method for removing visible oil, grease, soil or machining lubricants, and other soluble contaminants, from steel surfaces
Note 1 to entry: For more details and cleaning methods see Iso 12944-4:2017, 6.2.
3.4
contaminated surface
surface on which matter deleterious to the performance of a protective coating system is present
Note 1 to entry: Typical contaminants include slag, rust, laminated rust scale, mill scale, oil, grease, welding flux and weld spatter, soluble iron corrosion products and other soluble salts, including chlorides and sulphates.
3.5
cleaned surface
surface from which the contamination has been removed to the specified or agreed level of surface cleanliness
Note I to entry: Full details are given in Iso 8501-1 and ISO 8501-2.
Remove any burrs, sharp ridges or sharp cuts that have been produced during the cleaning operation (see Iso 8501-3).
Immediately before painting, unless otherwise specified, ensure that any remaining sound paint has no residual gloss. Ensure that the edges of any remaining intact paint have been feathered (bevelled) using one of the methods given in 43 or 4A.
Dry the surface, if necessary, and remove any residual loose matter resulting from the cleaning methods by brushing, vacuum cleaning or a blast of clean, dry compressed air.
5 Reference standards
Unless otherwise agreed, visual reference standards shall be used to supplement the cleaning criteria given in Clause 4. These reference standards shall be either samples or photographs provided by one of the parties or published reference standards as given in ISO 850 1-1 or ISO 850 1-2 (see also Introduction, last paragraph).ISO-8504-3-2018