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.

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, note the different approval standards required for different types of ISO documents. This document has been drafted in accordance with the editing rules in Part 2 of the ISO/IEC Directive (see iso.org/directives).

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

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 following URL:iso.org/iso/foreword.html.

This document has been prepared by the Technical Committee ISO/TC 35, Paints and Varnishes, SC 9, General Test Methods for Paints and Varnishes.

The second edition cancelled and replaced the first edition (ISO 2812-4:2007), which was a minor revision. The changes from the previous edition are as follows: CAS numbers have been added to the reagents listed in Appendix A and terms and definition clauses have been added.

A list of all the parts in the ISO 2812 series can be found on the ISO website.

ISO 2812-4-2017 “Paints and varnishes — Determination of liquid resistance — Part 4: Sampling method”

1 range
This document specifies the point-sample method used to determine the resistance of single – or multilayer coating material systems to the effects of liquid or paste products.

These methods enable the tester to determine the effect of the test substance on the coating and, if necessary, to assess damage to the substrate.

2 Normative references
The following files are referenced in the text in such a way that some or all of the content constitutes the requirements of this document. For dated references, citation-only versions apply. For undated references, the latest 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 3270, Paints and varnishes and their Raw materials – Regulate and test temperature and humidity

ISO 4618, Paints and varnishes — Terms and definitions

ISO 4628-1, Paints and varnishes – Assessment of coating degradation – Designation of intensity of uniform variation in number and size of defects and appearance – Part 1: General introduction and designation of systems

ISO 4628-2, Paints and varnishes – Assessment of coating degradation – designation of number and size of defects, and intensity of uniform changes in appearance – Part 2: Assessment of degree of foaming

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

3 Terms and Definitions
For the purposes of this document, the terms and definitions given in ISO 4618 apply.

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— IEC electronic encyclopedia: available at electropedia.org/

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