Plastics — Parameters comparing the spectral irradiance of a laboratory light source for weathering applications to a reference solar spectral irradiance

This document specifies a calculation method which allows calculating a parameter which compares the spectral irradiance of a laboratory radiation source for weathering application to a reference solar spectral irradiance.

Plastiques — Paramètres de comparaison de la distribution spectrale d'une source de lumière de laboratoire pour les applications de vieillissement et d'une distribution spectrale solaire de référence

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Status
Published
Publication Date
25-Nov-2018
Current Stage
6060 - International Standard published
Start Date
26-Nov-2018
Completion Date
26-Nov-2018
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ISO/TR 18486:2018 - Plastics -- Parameters comparing the spectral irradiance of a laboratory light source for weathering applications to a reference solar spectral irradiance
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TECHNICAL ISO/TR
REPORT 18486
Second edition
2018-12
Plastics — Parameters comparing the
spectral irradiance of a laboratory
light source for weathering
applications to a reference solar
spectral irradiance
Plastiques — Paramètres de comparaison de la distribution spectrale
d'une source de lumière de laboratoire pour les applications de
vieillissement et d'une distribution spectrale solaire de référence
Reference number
ISO/TR 18486:2018(E)
ISO 2018
---------------------- Page: 1 ----------------------
ISO/TR 18486:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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Published in Switzerland
ii © ISO 2018 – All rights reserved
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ISO/TR 18486:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols .......................................................................................................................................................................................................................... 1

5 Significance ................................................................................................................................................................................................................ 2

6 Requirements .......................................................................................................................................................................................................... 2

7 Calculation methods ......................................................................................................................................................................................... 2

7.1 Characterizing parameter for a wavelength range .................................................................................................. 2

7.1.1 Choice of the wavelength range .......................................................................................................................... 2

7.1.2 Scaling condition .............................................................................................................................................................. 3

7.1.3 Characterizing parameter f for a wavelength range .............................................................. 4

λ1-λ2

7.2 Characterizing parameter for a known action spectrum ................................................................................... 4

7.2.1 Choice of the wavelength range with action spectrum ................................................................... 4

7.2.2 Scaling condition with action spectrum ...................................................................................................... 4

7.2.3 Characterizing parameter f with action spectrum ...................................................... 5

s(λ)1-s(λ)2

Annex A (informative) Examples for parameters of some commercially available solar

simulators .................................................................................................................................................................................................................... 6

Bibliography ................................................................................................................................................................................................................................ 8

© ISO 2018 – All rights reserved iii
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ISO/TR 18486:2018(E)
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).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions 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 second edition cancels and replaces the first edition (ISO/TR 18486:2016), which has been

technically revised. The main changes compared to the previous edition are as follows:

— Figures 1, 2 and A.1: the keys and their key descriptions have been corrected;
— the document has been editorially revised.

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 © ISO 2018 – All rights reserved
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ISO/TR 18486:2018(E)
Introduction

Laboratory radiation sources generate radiation which is intended to simulate a defined “reference

sun” as perfect as possible, where the fitting to the spectral irradiance in the materials sensitive range

is most important. So far, the fitting is described verbally only (e.g. standards concerning artificial

weathering) and the user decides for himself if the spectral irradiance E(λ) indicated by the producer

of the laboratory radiation source agrees suitable enough with the “reference sun” for his specific

application or, occasionally, the classification describes the fitting to a wanted “reference sun” only

insufficiently (e.g. for standard weathering tests).

This document deals with a procedure for the determination of objective factors characterizing the

grade of fitting in quantity.

One procedure describes the grade of fitting of a laboratory radiation source to the defined reference

sun for specific spectral ranges. A second procedure results in characterizing parameters for the

respective wavelength ranges, incorporating known action spectra.
© ISO 2018 – All rights reserved v
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TECHNICAL REPORT ISO/TR 18486:2018(E)
Plastics — Parameters comparing the spectral irradiance
of a laboratory light source for weathering applications to
a reference solar spectral irradiance
1 Scope

This document specifies a calculation method which allows calculating a parameter which compares

the spectral irradiance of a laboratory radiation source for weathering application to a reference solar

spectral irradiance.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
spectral irradiance
radiant flux per unit area per wavelength interval
–2 –1

Note 1 to entry: It is measured in watts per square metre per nanometre (W ⋅ m ⋅ nm ).

3.2
action spectrum

description of the spectral efficiency of radiation to produce a particular polymer response (specific

property change of a specific polymer) plotted as a function of the wavelength of the radiation

Note 1 to entry: Data of an action spectrum are specific to the polymer but independent from the radiation

source, also named spectral sensitivity.
4 Symbols
–2 –1
E(λ) spectral irradiance of reference sun (W ⋅ m ⋅ nm )
ref.
–2 –1
E(λ) spectral irradiance of laboratory radiation source (W ⋅ m ⋅ nm )
source
–2 –1
...

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