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ISO 8501 Book Corrosion Protection of Steel Structures by Painting

ISO 8501 -1 Book

ISO 8501 Book

ISO-8501 Book

In 2007 updated version of the standard measure for the visual evaluation of rust and purity levels of non-coated steel. Also known as the “Swedish steel blasting grades” SS 05 59 00 (Sa). Contains high-quality color 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 8501-1 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee Section 12. Preparation of steel substrates before application of paints and related products.
This second edition cancels and replaces the first edition (ISO 8501-1:1988). The main change is the Informative Supplement ISO 8501-1:1988/Suppl.1994 has been includ as Annex A.
ISO 8501 consists of the following parts, under the general title Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness:

The Book identifies four levels (designated as Rust Grades) of mill scale and rust that are commonly found on surfaces of uncoated erected steel and steel held in stock.  It also identifies certain degrees of visual cleanliness (designated as Preparation Grades) after surface preparation of uncoated steel surfaces and of steel surfaces after overall removal of any previous coating.

Four Rust Grades, designated A, B, C, and D respectively are specified.

There are also fourteen Preparation Grades by blast-cleaning, indicating the degree of cleaning, together with detailed descriptions of the surface appearance to the following Sa Grades.

Grade Sa 1.  Light blast-cleaning.

Grade Sa 2.  Thorough blast-cleaning.

Grade Sa 2 1⁄2.  Very thorough blast-cleaning.

Grade Sa 3.  Blast-cleaning to visually clean steel.


ISO 8501 -2

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.

ISO8501 -3

Describes preparation grades of welds, cut edges and other areas, on steel surfaces with imperfections. Such imperfections can become visible before and/or after an abrasive blast-cleaning process. The preparation grades given are to make steel surfaces with imperfections, including welded and fabricated surfaces, suitable for the application of paints and also related products.

ISO 8501 -4

Specifies a series of preparation grades for steel surfaces after removal/partial removal of water-soluble contaminants, rust, previous paint coatings and also foreign matter by high-pressure water jetting. The writer defined, and descriptions together with photographs of various grades. That are representative examples within the tolerances for each grade as described in words. In addition, this part of ISO 8501 specifies both initial surface conditions and after-cleaning flash rust grades, also defined by written descriptions together with representative photographic examples.

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What is ISO

ISO is an international standard development organization compose of representatives from the national standards organizations of member countries. Membership requirements are given in Article of the ISO Statutes. It was found on 23 February 1947, and (as of November 2022) it has published over 24,500 international standards covering almost all aspects of technology and also manufacturing. It has 811 Technical committees and sub committees to take care of standards development. The organization develops and publishes standardization in all technical and nontechnical fields other than electrical and also electronic engineering, which is handle by the IEC.  It is headquarter in Geneva, Switzerland, and works in 167 countries as of 2023. The three official languages are English, French, and Russian.


The work of preparing International Standards is normally carry out through organization technical committees. Each member body interest in a subject for which a technical committee has been establish has the right to be representation on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards already draft in accordance with the rules given in the ISO/IEC Directives. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.


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 Firstly the presence of rust and mill scale; Secondly the presence of surface contaminants, including salts, dust, oils and greases; Finally the surface profile. International Standards ISO 8501, ISO 8502 and ISO 8503 have been preparing 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. These International Standards do not contain recommendations for the protective coating systems to be apply 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 applying and on its performance. Such recommendations are given 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 exposing and for the protective coating system to be use. — within the capability of the cleaning procedure specify. We provide ISO 8501-1 Books , and for more detail information please contact us.

TQC Sheen

What is TQC Sheen

TQC Sheen brand TQC Sheen name has been recognize as a leader in innovative paint test equipment since 1947. And as part of Industrial Physics – a global packaging, product, and material test and inspection partner – we’re able to protect the integrity of manufacturers, production lines, and laboratories across a multitude of industries all over the world. We can help you to understand anything you need to know about your inks and coatings testing process. Our brand is known for innovative paint test equipment. TQC Sheen offers a wide variety of products. Including a range of wash ability testers, appearance meters, coating thickness gauges, automatic film applicators and also bresle patches. All products are design to meet the highest quality standards. Across our organization, we provide you with all kinds of coating test devices. From washability testers, appearance meters, and coating thickness gauges – through to automatic film applicators and bresle patches. Our solutions are relied upon by R&D laboratories and paint manufacturers alike – so you can breathe easy with TQC Sheen test equipment. Our viscosity measurement instruments are uses in laboratories and production facilities all over the world. And our instruments adhere to a variety of international testing standards.


In  our brand line of business where quality is the keyword for our customers. We decide to have our organisations certify according the ISO 9001 standards by “Det Norske Veritas”. High quality products are supply and also maintain by our efficient organisation following well-structure procedures. And also always keeping the customers wishes in the first place! As part of Industrial Physics – a global packaging, product, material test and also inspection partner. We’re able to protect the integrity of manufacturers, production lines, and also laboratories across a multitude of industries all over the world. We can help you to understand anything you need to know about your paints and also surface coatings. The TQC Sheen name has been recognize as a leader in innovative paint test equipment since 1947. We make all kinds of testing devices. From wash-ability testers, appearance meters and coating thickness gauges – through to automatic film applicators and bresle patches. PT. Cuanli Perkasa Jaya is one of TQC Sheen worldwide distributors location in Indonesia
TQC Sheen brand