ISO 4624-2016 Paints and varnishes – Adhesion test by drawing method

A Preface
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ISO 4624-2016 Paints and varnishes – Adhesion test by drawing method

Any trade names used in this document are provided as information for the convenience of the user and do not constitute an endorsement.

For ISO conformity assessment related specific terminology and express the meaning of the specification, as well as the relevant ISO in technical barriers to trade (TBT) comply with the WTO principles of information, please refer to the following URL: preface – supplemental information

The committee responsible for this document is ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.

The third edition removes and replaces the second edition (ISO 4624:2002), which was technically revised with the following changes:

ISO 4624-2016 Paints and varnishes – Adhesion test by drawing method

a) Added detailed information on how to avoid substrate deformation during tensile testing;

b) The three methods of using one cart or two carts and two carts (one for the paint substrate) on the painted panel have been named methods A, B and C;

c) The supplementary test conditions previously in Annex A have been incorporated into the test report.

This International standard is one of two standards describing a method for assessing the adhesion of a single or multi-coating system of paint, varnish or related products by measuring the minimum tensile stress required to separate or break the coating in a direction perpendicular to the substrate.

Test results are influenced not only by the mechanical properties of the system under test, but also by the nature and preparation of the substrate, method of paint application, coating drying conditions, temperature, humidity and other factors such as the type of test instrument already used.

ISO 4624-2016 Paints and varnishes – Adhesion test by drawing method

Another international standard for assessing bonding properties is ISO 2409.

1 Scope
This standard specifies three methods (i.e. paint on the front panel of a car or two cars, one as coating substrate), through a single coating of paint, varnish, or related products or multi-layer coating system on the pull off test to determine the adhesion.

These test methods can be used to compare different coating adhesion behavior. It is most applicable to provide a relative rating for a range of coated panels that exhibit significant differences in adhesion.

The test can be performed using a variety of substrates. Different procedures are given depending on whether the substrate is deformable, such as thin metal, plastic and wood, or rigid, such as thick concrete and metal plates. To avoid substrate deformation during tensile testing, a sandwich structure is usually used. For example, for a special purpose, coating can be directly coated on the surface of test cart.

ISO 4624-2016 Paints and varnishes – Adhesion test by drawing method

2 Normative references
The following documents are referred to normatively in whole or in part in this document and are required for their application. For dated references, only the cited version applies. For undated references, the references of the new version (including any amendment) applies.

ISO 1513, paints and varnishes – checking and preparation of test samples

ISO 1514, Paints and varnishes — Test standard panel

ISO 2808, Paints and varnishes — Determination of film thickness

ISO 3270, paints and varnishes and its raw materials – to adjust and test the temperature and humidity

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

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