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.

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 set international standards. The draft international standards adopted by the Technical Committee will be circulated to member bodies for voting. Publication as an international standard requires approval by at least 75% of member bodies.

Please note that certain contents 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 testing procedures for assessing the resistance of paints, varnishes and related product coatings to cracking and/or detachment from 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 the details, for example

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

– Expression of test results.

In this standard, the basic elements common to US, European and Japanese standards are adopted, but details that differ between US, European and Japanese standards, particularly the use of mandrel or gasket panels, have been agreed upon by the parties concerned.

1 range
This standard describes a method for assessing the flexibility and adhesion of organic coatings on metal substrates 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.

2 Normative references
The following reference documents are not available or available for use in this document. For dated references, citation-only versions apply. For undated references, the 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°

3.2 T-bend rating

The number of spacers of the minimum thickness at which the coating test plate can be bent (or, if bent around the mandrel, equivalent to the diameter of the mandrel) without cracking or loss of coating adhesion (peeling)

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