ISO 4582:2025
(Main)Plastics — Determination of changes in colour and variations in properties after exposure to glass-filtered solar radiation, natural weathering or laboratory radiation sources
Plastics — Determination of changes in colour and variations in properties after exposure to glass-filtered solar radiation, natural weathering or laboratory radiation sources
This document specifies methods for determining changes in colour and other appearance properties, and variations in mechanical or other properties, of plastics that have been exposed to glass-filtered solar radiation, to natural weathering or to simulated solar radiation from a laboratory source. The procedure used to analyse data depends on whether the test used to characterize the materials being exposed is destructive or non-destructive. The exposures are conducted under conditions specified in specific exposure standards (e.g. the ISO 877 series and the ISO 4892 series).
Plastiques — Détermination des changements de coloration et des variations de propriétés après exposition au rayonnement solaire derrière une vitre en verre, au vieillissement naturel ou aux sources de rayonnement de laboratoire
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International
Standard
ISO 4582
Fifth edition
Plastics — Determination of changes
2025-09
in colour and variations in properties
after exposure to glass-filtered solar
radiation, natural weathering or
laboratory radiation sources
Plastiques — Détermination des changements de coloration et
des variations de propriétés après exposition au rayonnement
solaire derrière une vitre en verre, au vieillissement naturel ou
aux sources de rayonnement de laboratoire
Reference number
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Determination of changes in colour or other appearance attributes . 2
4.1 General .2
4.2 Changes in colour .3
4.2.1 Principles .3
4.2.2 Apparatus .3
4.2.3 Test specimens .3
4.2.4 Procedure .3
4.3 Changes in other appearance properties .5
5 Determination of changes in mechanical or other properties . 5
5.1 Principles .5
5.2 Apparatus .6
5.3 Test specimens.6
5.4 Procedure .6
5.4.1 Determination of initial properties .6
5.4.2 Storage of file specimens .7
5.4.3 Determination of properties after exposure .7
6 Expression of results . 7
6.1 Changes in colour .7
6.1.1 Instrumental measurements.7
6.1.2 Visual assessment .7
6.2 Changes in other appearance properties .7
6.2.1 Instrumental measurements.7
6.2.2 Visual assessment of change in appearance attributes .8
6.2.3 Changes in mechanical and other properties .8
7 Precision . 9
8 Test report . 9
Annex A (normative) Statistical formulae based on ISO 2602 for determination of mean and
standard deviation and procedure for determination of time to 50 % loss of property .10
Annex B (informative) Possible effects of surface cleaning on assessment of exposure .15
Annex C (informative) Measurements of changes in mechanical properties .16
Bibliography . 19
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
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 fifth edition cancels and replaces the fourth edition (ISO 4582:2017), which has been technically
revised.
The main changes are as follows:
— in 4.2.2.1 and 4.2.4.2, references to CIE tristimulus values and corresponding International Standard
ISO/CIE 11664-3 and ASTM E1347 have been deleted;
— in Table 1, ISO 4628-4 for cracking and crazing has been added;
— in Table 2, ISO 4765 for chemical changes has been added;
— in 5.4, standard atmosphere 23/50 has been changed to class 2;
— in 6.2.2, reference to ISO 4628-1:2016, Table 3 has been added;
— a new Annex C (Measurements of changes in mechanical properties) has been added.
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
Introduction
A number of different exposure techniques can be used to provide information on the effects of environmental
stresses such as simulated solar radiation, heat and water on plastics (see the ISO 877 series and the ISO 4892
series). Each exposure test has its own particular application and relevance. When determining changes in a
particular property or attribute of a material subjected to different exposures, the same evaluation methods
should be used after all exposures to ensure meaningful results.
Results for plastics subjected to exposure tests are strongly dependent on the type of exposure conditions
used, the type of plastic being tested and the property being evaluated. A result obtained for one property
might not be the same as that for a different property of the same material, even if the same exposure test
is used. This document is not intended to establish a fixed procedure for conducting the exposure test, but
is intended to provide a set of specific procedures used to express the results for change in a characteristic
property of the material after it has been exposed. It is up to the user to determine which exposure conditions
are most relevant to the specific material and the service conditions being used.
Test methods should be selected to determine changes in appearance and properties of the exposed material
with its proposed application in mind. The exposure test used should be devised to discriminate among
materials based on such changes. This document suggests typical properties that can be used to determine
changes in plastics which have been subjected to exposure tests.
NOTE Because of large differences in the spectral distribution of the radiation sources used, there can be large
differences in results for the same plastics exposed in the various devices described in the ISO 4892 series. Therefore,
comparisons between plastics are intended to be made only based on results from exposures in the same type of
device and under the same conditions. For optimum comparisons, plastics are expected to be exposed at the same
time in the same device.
v
International Standard ISO 4582:2025(en)
Plastics — Determination of changes in colour and variations
in properties after exposure to glass-filtered solar radiation,
natural weathering or laboratory radiation sources
1 Scope
This document specifies methods for determining changes in colour and other appearance properties,
and variations in mechanical or other properties, of plastics that have been exposed to glass-filtered solar
radiation, to natural weathering or to simulated solar radiation from a laboratory source.
The procedure used to analyse data depends on whether the test used to characterize the materials being
exposed is destructive or non-destructive. The exposures are conducted under conditions specified in
specific exposure standards (e.g. the ISO 877 series and the ISO 4892 series).
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 (includi
...
FINAL DRAFT
International
Standard
ISO/FDIS 4582
ISO/TC 61/SC 6
Plastics — Determination of
Secretariat: DIN
changes in colour and variations in
Voting begins on:
properties after exposure to glass-
2025-06-17
filtered solar radiation, natural
Voting terminates on:
weathering or laboratory radiation
2025-08-12
sources
Plastiques — Détermination des changements de coloration et
des variations de propriétés après exposition au rayonnement
solaire derrière une vitre en verre, au vieillissement naturel ou
aux sources de rayonnement de laboratoire
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 4582:2025(en) © ISO 2025
FINAL DRAFT
ISO/FDIS 4582:2025(en)
International
Standard
ISO/FDIS 4582
ISO/TC 61/SC 6
Plastics — Determination of changes
Secretariat: DIN
in colour and variations in properties
Voting begins on:
after exposure to glass-filtered solar
radiation, natural weathering or
Voting terminates on:
laboratory radiation sources
Plastiques — Détermination des changements de coloration et
des variations de propriétés après exposition au rayonnement
solaire derrière une vitre en verre, au vieillissement naturel ou
aux sources de rayonnement de laboratoire
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 4582:2025(en) © ISO 2025
ii
ISO/FDIS 4582:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Determination of changes in colour or other appearance attributes . 2
4.1 General .2
4.2 Changes in colour .3
4.2.1 Principles .3
4.2.2 Apparatus .3
4.2.3 Test specimens .3
4.2.4 Procedure .3
4.3 Changes in other appearance properties .5
5 Determination of changes in mechanical or other properties . 5
5.1 Principles .5
5.2 Apparatus .6
5.3 Test specimens.6
5.4 Procedure .6
5.4.1 Determination of initial properties .6
5.4.2 Storage of file specimens .7
5.4.3 Determination of properties after exposure .7
6 Expression of results . 7
6.1 Changes in colour .7
6.1.1 Instrumental measurements.7
6.1.2 Visual assessment .7
6.2 Changes in other appearance properties .7
6.2.1 Instrumental measurements.7
6.2.2 Visual assessment of change in appearance attributes .8
6.2.3 Changes in mechanical and other properties .8
7 Precision . 9
8 Test report . 9
Annex A (normative) Statistical formulae based on ISO 2602 for determination of mean and
standard deviation and procedure for determination of time to 50 % loss of property .10
Annex B (informative) Possible effects of surface cleaning on assessment of exposure .15
Annex C (informative) Measurements of changes in mechanical properties .16
Bibliography . 19
iii
ISO/FDIS 4582:2025(en)
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
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 fifth edition cancels and replaces the fourth edition (ISO 4582:2017), which has been technically
revised.
The main changes are as follows:
— in 4.2.2.1 and 4.2.4.2, references to CIE tristimulus values and corresponding International Standard
ISO/CIE 11664-3 and ASTM E1347 have been deleted;
— in Table 1, ISO 4628-4 for cracking and crazing has been added;
— in Table 2, ISO 4765 for chemical changes has been added;
— in 5.4, standard atmosphere 23/50 has been changed to class 2;
— in 6.2.2, reference to ISO 4628-1:2016, Table 3 has been added;
— a new Annex C (Measurements of changes in mechanical properties) has been added.
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/FDIS 4582:2025(en)
Introduction
A number of different exposure techniques can be used to provide information on the effects of environmental
stresses such as simulated solar radiation, heat and water on plastics (see the ISO 877 series and the ISO 4892
series). Each exposure test has its own particular application and relevance. When determining changes in a
particular property or attribute of a material subjected to different exposures, the same evaluation methods
should be used after all exposures to ensure meaningful results.
Results for plastics subjected to exposure tests are strongly dependent on the type of exposure conditions
used, the type of plastic being tested and the property being evaluated. A result obtained for one property
might not be the same as that for a different property of the same material, even if the same exposure test
is used. This document is not intended to establish a fixed procedure for conducting the exposure test, but
is intended to provide a set of specific procedures used to express the results for change in a characteristic
property of the material after it has been exposed. It is up to the user to determine which exposure conditions
are most relevant to the specific material and the service conditions being used.
Test methods should be selected to determine changes in appearance and properties of the exposed material
with its proposed application in mind. The exposure test used should be devised to discriminate among
materials based on such changes. This document suggests typical properties that can be used to determine
changes in plastics which have been subjected to exposure tests.
NOTE Because of large differ
...
Date: 2025-05-06
ISO/FDIS 4582:2025(en)
ISO/TC 61/SC 6/WG 2
Secretariat: DIN
Date: 2025-06-03
Plastics — Determination of changes in colour and variations in
properties after exposure to glass-filtered solar radiation, natural
weathering or laboratory radiation sources
Plastiques — Détermination des changements de coloration et des variations de propriétés après exposition à
la lumière du jour sousau rayonnement solaire derrière une vitre en verre, aux agents atmosphériquesau
vieillissement naturel ou aux sources lumineusesde rayonnement de laboratoire
FDIS stage
ISO/FDIS 4582:2025(en)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO'sISO’s member body in the country of the requester.
ISO Copyright Officecopyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: copyright@iso.org
E-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland.
ii
ISO/FDIS 4582:2025(en)
Contents
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Determination of changes in colour or other appearance attributes . 2
5 Determination of changes in mechanical or other properties . 5
6 Expression of results . 8
7 Precision . 9
8 Test report . 9
Annex A (normative) Statistical formulae based on ISO 2602 for determination of mean and
standard deviation and procedure for determination of time to 50 % loss of property . 11
Annex B (informative) Possible effects of surface cleaning on assessment of exposure . 18
Annex C (informative) Measurements of changes in mechanical properties . 19
Bibliography . 22
Foreword . v
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Determination of changes in colour or other appearance attributes . 2
4.1 General . 2
4.2 Changes in colour . 3
4.2.1 Principles . 3
4.2.2 Apparatus . 3
4.2.3 Test specimens . 3
4.2.4 Procedure . 3
4.3 Changes in other appearance properties . 5
5 Determination of changes in mechanical or other properties . 5
5.1 Principles . 5
5.2 Apparatus . 6
5.3 Test specimens . 7
5.4 Procedure . 7
5.4.1 Determination of initial properties . 7
5.4.2 Storage of file specimens . 7
5.4.3 Determination of properties after exposure . 7
6 Expression of results . 8
6.1 Changes in colour . 8
6.1.1 Instrumental measurements . 8
6.1.2 Visual assessment . 8
6.2 Changes in other appearance properties . 8
iii
ISO/FDIS 4582:2025(en)
6.2.1 Instrumental measurements . 8
6.2.2 Visual assessment of change in appearance attributes . 8
6.2.3 Changes in mechanical and other properties . 8
7 Precision . 9
8 Test report . 9
Annex A (normative) Statistical formulae based on ISO 2602 for determination of mean and
standard deviation and procedure for determination of time to 50 % loss of property . 11
A.1 Calculation of mean and standard deviation for property changes measured using non-
destructive tests . 11
A.2 Calculation of mean and standard deviation for percent property retention measured
using non-destructive tests . 11
A.3 Calculation of mean and standard deviation for percent property retention measured
using destructive tests . 12
A.4 Calculation of mean and standard deviation for relative changes in property measured
by destructive tests . 13
A.5 Calculation of exposure time or radiant energy to achieve specified property change . 14
Annex B (informative) Possible effects of surface cleaning on assessment of exposure . 16
Annex C (informative) Measurements of changes in mechanical properties . 17
C.1 General remarks on weathering influence on mechanical properties . 17
C.2 Specific mechanical tests . 17
C.2.1 Quasi-static tests . 17
C.2.1.1 Tensile test . 17
C.2.1.2 Tensile creep test . 18
C.2.2 Dynamic tests . 18
C.2.2.1 High-rate tensile test . 18
C.2.2.2 Puncture impact test . 18
C.2.2.3 Charpy impact testing (flexural) . 18
Bibliography . 20
iv
ISO/FDIS 4582:2025(en)
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 this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for identifying any or all such
patent rights.
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 fifth edition cancels and replaces the fourth edition (ISO 4582:2017), which has been technically revised.
The main changes are as follows:
— — in 4.2.2.1.4.2.2.1 and 4.2.4.2,4.2.4.2, references to CIE tristimulus values and corresponding
International Standard ISO/CIE 11664-3 and ASTM E1347 have been deleted;
— — in Table 1,Table 1, ISO 4628-4 for cracking and crazing has been added;
— — in Table 2,Table 2, ISO 4765 for chemical changes has been added;
— — in 5.4,5.4, standard atmosphere 23/50 has been changed to class 2;
— — in 6.2.2,6.2.2, reference to ISO 4628-1:2016, Table 3 has been added;
— — a new Annex Ca new Annex C (Measurements of changes in mechanical properties) has been added.
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