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.

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, 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 editing rules of ISO/IEC Directive Part 2 (see iso.org/directives).

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. Details of any patent rights identified during the preparation of the document will be found in the introduction and/or in the list of patent claims received by ISO (see iso.org/patents).

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

ISO 16474-3-2021 “Paints and varnishes laboratory light sources exposure test methods – Part 3: Fluorescent ultraviolet lamps”

Voluntary, related standards and conformity assessment related ISO specific terminology and express the meaning of and the ISO in the technical barriers to trade (TBT) adhere to the principle of the world trade organization (WTO) information, please see the iso.org/iso/foreword.html.

This document has been prepared by the Technical Committee ISO/TC 35 (Paints and varnishes), Sub-Committee SC 9 (General Test methods for paints and varnishes) in cooperation with the Technical Committee CEN/TC 139 (Paints and Varnishes) of the European Committee for Standardization (CEN), in accordance with the ISO-CEN Technical Cooperation Agreement (Vienna Agreement).

The second edition cancels and replaces the technically revised first edition (ISO 16474-3:2013). The main changes from the previous edition are as follows:

– In 7.2, the temperature difference between the blackboard sensor and the black label sensor has been corrected;

– In Table 4, the blackboard temperature is not controlled during water spraying is changed;

– The text has been edited and revised, and the normative references have been updated.

A list of all parts in the ISO 16474 series can be found on the ISO website.

Any feedback or questions regarding this document should be directed to the user’s national standards body. A complete list of these institutions can be found at iso.org/members.html.

ISO 16474-3-2021 “Paints and varnishes laboratory light sources exposure test methods – Part 3: Fluorescent ultraviolet lamps”

introduce
Coatings of paints, varnishes and similar materials (then simply referred to as coatings) are exposed to laboratory light sources in order to simulate in the laboratory the aging process that occurs during natural weathering or behind window glass.

1 Range
This document specifies methods for exposing coatings to fluorescent UV lamps, heat, and water in devices designed to reproduce the weathering effects that occur when materials are exposed to daylight in an actual end-use environment or through window glass.

The coatings are exposed to different types of fluorescent UV lamps under controlled environmental conditions (temperature, humidity, and/or water). Different types of fluorescent UV lamps can be used to meet all requirements for testing different materials.

Sample preparation and result evaluation are covered for specific materials in other ISO documents.

General guidance is given in ISO 16474-1.

Note that exposure to fluorescent UV lamps for plastics is described in ISO 4892-3.

ISO 16474-3-2021 “Paints and varnishes laboratory light sources exposure test methods – Part 3: Fluorescent ultraviolet lamps”

2 Normative references
The following files are referenced in text in a manner that constitutes part or all of the requirements 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 1514, Paints and varnishes – Standard panels for testing

ISO 2808, Paints and varnishes – Determination of film thickness

ISO 4618, paints and varnishes – Terms and definitions

ISO 9370, Plastics – Instrumental determination of radiation exposure in ageing tests – General guidance and basic test methods

ISO 16474-1:2013, Paints and varnishes. Methods of exposure to laboratory light sources. Part 1: General guidance

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

ISO and IEC maintain terminology databases for standardization at the following addresses:

– ISO Online browsing platform: available at https://iso.org/obp

– IEC e-encyclopedia: available at http://electropedia.org/

ISO 16474-3-2021 “Paints and varnishes laboratory light sources exposure test methods – Part 3: Fluorescent ultraviolet lamps”

3.1 Radiation Exposure

H Test the radiation energy exposed to the panel

Note 1: Radiation exposure is given by the following formula:

H is radiation exposure, measured in joules per square meter (J/m2);

E is irradiance, in watts per square meter (W/m2);

t is the exposure time, in seconds.

Note 2: If the irradiance E is constant throughout the exposure time, the radiant exposure H is given only by the product of E and t.

ISO 16474-3-2021 “Paints and varnishes laboratory light sources exposure test methods – Part 3: Fluorescent ultraviolet lamps”

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