introduction
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 electrical 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, attention should be paid to the different approval criteria required for different types of ISO documents. This document has been drafted in accordance with the editing rules of ISO/IEC Directive Part 2 (see iso.org/directives).

Please note that certain elements of this document may be subject to patent rights. ISO is not responsible for identifying any or all such patents. Details of any patent rights identified during the preparation of the document will be found in the introduction and/or in the list of patent claims received by ISO (see iso.org/patents).

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ISO 8504-2-2019 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 2: sandblasting

Voluntary, related standards and conformity assessment related ISO specific and express the meaning of terminology as well as in relevant ISO technical barriers to trade (TBT) adhere to the principle of the world trade organization (WTO) information, please refer to the iso.org/iso/foreword.html.

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

The third edition cancels and replaces the technically revised second edition (ISO 8504-2:2000). The main changes from the previous edition are as follows:

– Updating Article 2, normative reference;

— Edit and revise.

ISO 8504-2-2019 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 2: sandblasting

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

Any feedback or questions regarding 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.

introduce
The protective coating properties of paint and related products applied to steel are significantly affected by the surface state of the steel 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 8504-2-2019 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 2: sandblasting

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

ISO 8504 series is suitable for new and corroded steel surfaces as well as uncoated or previously coated steel surfaces with paints and related products.

These international standards do not contain provisions for protective coating systems applied to steel surfaces. They do not contain provisions for surface quality requirements for specific cases, even though surface quality can directly affect the choice of protective coating to be applied and its performance. These provisions are found in other documents such as national standards and codes of practice. Users of these international standards should ensure the prescribed quality

– Compatible with and suitable for the environmental conditions to which the steel will be exposed and the protective coating system to be used, and

– Within the capacity of the specified cleaning procedure.

The main purpose of surface treatment is to ensure the removal of harmful substances and to obtain a surface that allows a satisfactory adhesion of the primer to the steel. It is also designed to help reduce the amount of contaminants that cause corrosion.

Sand blasting cleaning is an effective method for mechanical surface treatment. It is widely used because this surface treatment method has many of the versatile functions listed below.

ISO 8504-2-2019 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 2: sandblasting

– This method allows for high productivity.

The device can be fixed or mobile and adapted to the object to be cleaned.

– This method is suitable for most types and forms of steel surfaces.

– Many different surface states can be produced, such as different preparation grades and surface profiles.

– Can produce cleaning, shot peening, coarsening, smooth grinding and other effects.

– Can selectively remove partially failed coatings, leaving the sound coating intact.

– Abrasive bounce (rebound) can clean areas that would otherwise be inaccessible.

1 Range
This document specifies a sandblasting cleaning method for preparing steel surfaces prior to application of paint and related products. It provides information about the effectiveness of each method and its field of application. It describes the equipment to be used and the procedures to be followed.

Note that these methods are mainly used for hot rolled steel to remove mill scale, rust, etc., but can also be used for cold rolled steel of sufficient thickness to withstand the deformation caused by abrasive impact.

ISO 8504-2-2019 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 2: sandblasting

2 Normative references
The following files are referenced in text in a manner that constitutes part or all of the requirements of this document. For dated references, only the cited version applies. For undated references, a new version of the reference (including any revisions) applies.

ISO 4628-3, Paints and varnishes – Assessment of degradation of coatings – number and size of defects and assignment of intensity of uniform change in appearance – Part 3: Assessment of degree of rust

ISO 8501 (all parts), Preparation of steel substrates prior to painting and related products – visual assessment of surface cleanliness

ISO 8502 (all parts), preparation of steel substrates – surface cleanliness assessment tests prior to coating of paints and related products

ISO 8503 (all parts), Preparation of steel substrates prior to coating of paints and related products – sandblasting clean the surface roughness characteristics of steel substrates

ISO 11124 (all parts), Specification for preparation of Steel substrates prior to application of paints and related products – Metal blasting abrasive Cleaning

ISO 11126 (all parts), Specification for the preparation of steel substrates prior to application of paints and related products – Non-metallic abrasive blasting for cleaning

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO 8504-2-2019 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 2: sandblasting

3.1 Sand blasting cleaning

The high kinetic energy abrasive flow is impounded onto the surface to be prepared

3.2 Sand blasting for abrasive cleaning

Solid materials for sandblasting cleaning (3.1)

3.3 Shooting

A predominantly circular particle with a length less than twice the maximum grain width and without edges, broken surfaces, or other sharp surface defects

3.4 Gravel

The grain is mainly angular, the surface is broken, the edge is sharp, and the shape is less than half circle

3.5 cylinder

A particle with a sharp edge, with a diameter to length ratio of 1:1, and cut so that its face is approximately at a right Angle to its center line

ISO 8504-2-2019 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 2: sandblasting

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