A 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 in the committee. Government and non-governmental international organizations that liaize with standardization organizations are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.

The procedures used to develop this document as well as those used for further maintenance are described in Part 1 of the ISO/IEC Directive. In particular, attention should be paid to the different approval criteria required for different types of ISO documents. This document has been drafted in accordance with the editorial rules of Part 2 of the ISO/IEC Directive (see iso.org/directives).

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

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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 3248:1998), which was technically revised with the following changes:

ISO 3248-2016 – Determination of thermal effects of paints and varnishes

1) Cooling of the test panel after the test is changed from standard temperature to ambient temperature;

b) a principle clause has been added;

c) Normative references have been updated;

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

1 Scope
This standard specifies a method for determining the resistance of single or multi-coating systems of paints, varnishes or related products to changes in gloss and/or colour, foaming, cracking and/or shedding from the substrate under specified temperature conditions.

This procedure applies to products intended for use in household radiators or other items that may withstand similar temperatures.

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 new version of the reference (including any revisions) applies.

ISO 3248-2016 – Determination of thermal effects of paints and varnishes

ISO 1513, Paints and varnishes – Examination and preparation of test samples

ISO 1514, Paints and varnishes — Test standard panel

ISO 1518-1, paints and varnishes — Determination of scratch resistance — Part 1: constant loading method

ISO 1519, Paints and varnishes — Bending test (Cylindrical mandrel)

ISO 1520, Paints and varnishes — Cup test

ISO 2808, Paints and varnishes — Determination of film thickness

ISO 3270, Paints and varnishes and their raw materials – temperature and humidity regulated and tested

ISO 6272-1, paints and varnishes — Rapid deformation (impact resistance) test — Part 1: drop hammer test, large area indenters

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

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