ISO 4892-4:2024
(Main)Plastics — Methods of exposure to laboratory light sources — Part 4: Open-flame carbon-arc lamps
Plastics — Methods of exposure to laboratory light sources — Part 4: Open-flame carbon-arc lamps
This document specifies methods for exposing specimens to open-flame carbon-arc lamps in the presence of moisture to reproduce the weathering effects that occur when materials are exposed in actual end-use environments to global solar radiation, or to window-glass filtered solar radiation. The specimens are exposed to filtered open-flame carbon-arc light under controlled environmental conditions (temperature, moisture). Various filters are described. General guidance is given in ISO 4892-1.
Plastiques — Méthodes d'exposition à des sources lumineuses de laboratoire — Partie 4: Lampes à arc au carbone
General Information
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Standards Content (Sample)
International
Standard
ISO 4892-4
Fourth edition
Plastics — Methods of exposure to
2024-12
laboratory light sources —
Part 4:
Open-flame carbon-arc lamps
Plastiques — Méthodes d'exposition à des sources lumineuses de
laboratoire —
Partie 4: Lampes à arc au carbone
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
5.1 Laboratory light source .2
5.1.1 General .2
5.1.2 Spectral irradiance of open-flame carbon-arc lamps with daylight filters (type 1) .2
5.1.3 Spectral irradiance of open-flame carbon-arc lamps with window-glass filters
(type 2) .3
5.1.4 Spectral irradiance of open-flame carbon-arc lamps with extended-UV filters
(type 3) .4
5.1.5 Typical spectral irradiance:.4
5.1.6 Factors that can affect the spectral power distribution of open-flame carbon-
arc lamps .6
5.2 Test chamber .7
5.3 Radiometer .7
5.4 Thermometer .7
5.5 Moisture .7
5.5.1 General .7
5.5.2 Relative-humidity control equipment .7
5.5.3 Spray system .7
5.6 Specimen holders .7
5.7 Apparatus to assess changes in properties .8
6 Test specimens . 8
7 Test conditions . 8
7.1 Temperature .8
7.1.1 Black-standard/black-panel temperature .8
7.1.2 Chamber air temperature .8
7.2 Relative humidity of air .8
7.3 Spray cycle .8
7.4 Cycles with dark periods .9
8 Procedure . 9
8.1 Mounting the test specimens .9
8.2 Exposure .9
8.3 Measurement of radiant exposure .9
8.4 Determination of changes in properties after exposure.9
9 Exposure report. 9
Bibliography .10
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
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constitute an endorsement.
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related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 6, Ageing,
chemical and environmental resistance.
This fourth edition cancels and replaces the third edition (ISO 4892-4:2013), of which it constitutes a minor
revision.
The change is as follows:
— reference to CIE 85 updated to CIE 241.
A list of all parts in the ISO 4892 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
International Standard ISO 4892-4:2024(en)
Plastics — Methods of exposure to laboratory light sources —
Part 4:
Open-flame carbon-arc lamps
1 Scope
This document specifies methods for exposing specimens to open-flame carbon-arc lamps in the presence
of moisture to reproduce the weathering effects that occur when materials are exposed in actual end-use
environments to global solar radiation, or to window-glass filtered solar radiation.
The specimens are exposed to filtered open-flame carbon-arc light under controlled environmental
conditions (temperature, moisture). Various filters are described.
General guidance is given in ISO 4892-1.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 4582, Plastics — Determination of changes in colour and variations in properties after exposure to glass-
filtered solar radiation, natural weathering or laboratory radiation sources
ISO 4892-1, Plastics — Methods of exposure to laboratory light sources — Part 1: General guidance and
requirements
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Principle
4.1 Specimens of the materials to be tested are exposed to glass-filtered open-flame carbon-arc light, to
heat and to moisture continuously or in repetitive cycles.
4.2 The exposure conditions may be varied by selection of:
a) the light filter;
b) the type of exposure to moisture/humidity;
c) the length of exposure to light and moisture/humidity;
d) the exposure temperature;
e) the relative lengths of the light and dark periods.
The effect of moisture is usually produced by controlling the humidity of the air or by spraying the test
specimens with demineralized/deionized water or by condensation of water vapour on to the surfaces of the
specimens.
4.3 The procedure may include measurements of the irradiance and radiant exposure at the surface of the
specimens.
4.4 It is recommended that a similar material of known behaviour (a control) be exposed simultaneously
with the test specimens to provide a reference standard for comparative purposes.
4.5 Intercomparison of results obtained from specimens exposed in different apparatus should not
be made unless an appropriate statistical relationship has been established between the devices for the
particular material tested.
5 Appa
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