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.

International standards are drafted in accordance with the rules given in Part 2 of the ISO/IEC Directive.

The main task of the technical committee is to develop international standards. The draft international standard adopted by the Technical Committee will be circulated to the member bodies for voting. Publication as an international standard requires approval by at least 75% of member institutions.

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.

ISO 17132 was developed by Technical Committee ISO/TC 35, Paints and Varnishes, Subcommittee SC 9, General Test Methods for paints and varnishes.

ISO 17132-2007 Paints and varnishes T-bending Test

introduce
This international standard is one of five standards that specify empirical test procedures for assessing the resistance of paints, varnishes and related product coatings to cracking and/or falling off with the substrate under different deformation conditions. Other international standards are ISO 1519, ISO 1520, ISO 6272 and ISO 6860.

T-bend testing has been standardized in the United States (ASTM D 4145), Europe (EN 13523-7), and Japan (JIS G 3312). The test methods in these standards are basically the same, but differ in details, e.g

– Whether the coating test plate folds itself or bends around the mandrel or the test panel used as a gasket;

– Presentation of test results.

In this standard, the basic elements common to the United States, Europe and Japan standards are adopted, but the details that differ from the United States, Europe and Japan standards, in particular the use of mandrel or gasket panels, have been agreed by the parties concerned.

1 Range
This standard describes a method for assessing the flexibility and adhesion of an organic coating on a metal substrate by observing that the coating test plate cracks or loses adhesion when bent.

This method can be used to confirm that a paint, varnish or related product meets a given test requirement in a pass/fail test, or to determine the minimum bending diameter at which cracking will not occur.

ISO 17132-2007 Paints and varnishes T-bending Test

2 Normative references
The following reference files are difficult or lacking for the use 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 1513, Paints and varnishes – Examination and preparation of test samples

ISO 1514, Paints and varnishes – Standard panels for testing

ISO 2808, Paints and varnishes – Determination of film thickness

ISO 15528, Paints, varnishes and raw materials for paints and varnishes – Sampling

IEC 60454-2, specification for pressure sensitive tapes for electrical use – Part 2: Test methods

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

3.1 T-bend test

A test designed to determine the flexibility of a paint coating by bending the coating test panel by 180°

ISO 17132-2007 Paints and varnishes T-bending Test

3.2 T-bend rating

The number of spacer strips of the minimum thickness that the coating test plate can bend (or, if bent around the mandrel, equivalent to the number of spacer strips of the mandrel diameter) without cracking or coating adhesion loss (peeling).

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