preface
ISO (International Organization for Standardization) is a global alliance of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member institution interested in a subject on which a technical committee has been established has the right to be represented on that committee. International governmental and non-governmental organizations liaising with ISO are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those used for further maintenance are described in Part 1 of the ISO/IEC Directive. In particular, note the different approval standards required for different types of ISO documents. This document has been drafted in accordance with the editing rules in Part 2 of the ISO/IEC Directive (see iso.org/directives).

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This document is prepared by Technical Committee ISO/TC 35, Paints and Varnishes, Subcommittee SC 12, Preparing steel substrates prior to application of paints and related products.

The third edition cancelled and replaced the technically revised second edition (ISO 8504-1:2000). The main changes from the previous edition are as follows:

— Updating normative references;

— Edit and revise.

A list of all the parts in the ISO 8504 series can be found on the ISO website.

Any feedback or questions about this document should be directed to the user’s national standards body. A complete list of these institutions can be found at iso.org/members.html.

ISO 8504-1-219 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 1: General Principles”

introduce
The properties of protective coatings applied to steel and related products are significantly affected by the state of the steel surface before coating. The main factors known to affect this performance are

— the presence of rust and dirt,

— The presence of surface contaminants, including salt, dust, oil and grease, and

– Surface outline.

ISO 8501, ISO 8502, and ISO 8503 series provide methods for assessing these factors, while ISO 8504 series provides guidance on preparation methods that can be used to clean steel substrates, indicating the ability of each to achieve specified levels of cleanliness.

These international standards do not contain recommendations for protective coating systems applied to steel surfaces. They do not contain recommendations for surface quality requirements for specific cases, even though surface quality will have a direct impact on the choice of protective coatings and their properties. These recommendations are found in other documents such as national standards and codes of practice. These international standards are used to ensure specified quality

– Compatible with and applicable to the environmental conditions to which the steel is to be exposed and the protective coating system to be used, and

— Within the capacity of the specified cleaning procedure.

This document should be read in conjunction with ISO 8504-2, ISO 8504-3, which describe specific surface treatment methods.

1 range
This document describes general principles for selecting methods for preparing steel surfaces prior to the application of paints and related products. It also contains information about the characteristics to consider when selecting and specifying certain surface treatments and preparation grades.

2 Normative references
The following files are referenced in the text in such a way that some or all of the content constitutes the requirements of this document. For dated references, citation-only versions apply. For undated references, the latest version of the reference (including any revisions) applies.

ISO 8501-1, Preparation of steel substrates prior to painting and related products – Visual assessment of surface cleanliness – Part 1: Rust classes and preparation classes of uncoated steel substrates and steel substrates after the overall removal of prior coatings

ISO 8501-2, Preparation of steel substrates prior to painting and related products – Visual assessment of surface cleanliness – Part 2: Preparation grade of previously coated steel substrates after local removal of prior coatings

ISO 8501-4, Preparation of steel substrates prior to coating of paints and related products – Visual assessment of surface cleanliness – Part 4: Initial surface conditions associated with high pressure water jets, preparation class and flash class

ISO 8502 (all parts), Preparation of steel substrate – Surface cleanliness Assessment tests prior to coating of paints and related products

ISO 8503 (all parts), Preparation of Steel substrate prior to application of paint and related products – sandblasting clean the surface roughness characteristics of steel substrate

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