ISO/FDIS 4892-1

FINAL DRAFT
International
Standard
ISO/TC 61/SC 6
Plastics — Methods of exposure to
Secretariat: DIN
laboratory light sources —
Voting begins on:
2024-07-22
Part 1:
General guidance and requirements
Voting terminates on:
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Reference number
FINAL DRAFT
International
Standard
ISO/TC 61/SC 6
Plastics — Methods of exposure to
Secretariat: DIN
laboratory light sources —
Voting begins on:
Part 1:
General guidance and requirements
Voting terminates on:
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 2024
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ii
Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
4.1 General .3
4.2 Significance . . .3
4.3 Use of accelerated tests with laboratory light sources .5
5 Requirements for laboratory exposure devices . 6
5.1 Irradiance .6
5.2 Temperature .7
5.3 Humidity and wetting .10
5.4 Other requirements for the exposure device .11
6 Test specimens .11
6.1 Form, shape and preparation .11
6.2 Number of test specimens . 12
6.3 Storage and conditioning . 12
7 Test conditions and procedure .13
7.1 Set points for exposure conditions . 13
7.2 Property measurements on test specimens.14
7.3 Sampling for intermediate and final evaluation .14
8 Periods of exposure and evaluation of test results. 14
8.1 General .14
8.2 Use of control materials .14
8.3 Use of results in specifications . 15
9 Test report .15
Annex A (normative) Procedures for measuring the irradiance uniformity in the specimen
exposure area .18
Annex B (informative) Factors that decrease the degree of correlation between artificial
accelerated weathering or artificial accelerated irradiation exposures and actual-use
exposures .21
Annex C (informative) Solar spectral irradiance standards .24
Bibliography .27

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, in collaboration with the European Committee for Standardization
(CEN) Technical Committee CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 4892-1:2016), which has been technically
revised.
The main changes are as follows:
— the definition of file specimen (see 3.2) and weathering reference material (see 3.5) have been clarified
and Notes to entry have been added;
— definition and Notes to entry of artificial accelerated weathering (see 3.3) and artificial accelerated
irradiation (see 3.4) have been clarified;
— new terms, definitions and Notes to entry have been added for black-panel thermometer (see 3.7), black-
standard thermometer (see 3.8), white-panel thermometer (see 3.9), and white-standard thermometer
(see 3.10);
— reference to ISO/TR 18486 has been added under 4.2.4;
— calibration requirements have been clarified in 5.1.7, 5.2.8, 5.2.9, 5.3.6;
— requirements regarding black-panel thermometer, black-standard thermometer, white-panel
thermometer, and white-standard thermometer in 5.2 and Table 2 have been clarified;
— reference to ISO 23741 has been added in 5.3.1;
— new subclause 7.3 “Sampling for intermediate and final evaluation” has been added;
— requirements for the test report have been updated;
— reference to CIE 85 in Annex C has been updated to CIE 241.

iv
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.

v
Introduction
Plastics are often used outdoors or in indoor locations where they are exposed to solar radiation or to
solar radiation behind glass for long periods. It is therefore very important to determine the effects of
solar radiation, heat, moisture and other climatic stresses on the colour and other properties of plastics.
Outdoor exposures to solar radiation and to solar radiation filtered by window glass are described in
[1]
ISO 877 (all parts) . However, it is often necessary to rapidly determine the effects of radiation, heat and
moisture on the physical, chemical and optical properties of plastics with artificial accelerated weathering
or artificial accelerated irradiation exposures that use specific laboratory light sources. Exposures in these
laboratory devices are conducted under more controlled conditions than found in natural environments and
are intended to accelerate eventual polymer degradation and product failures.
Relating results from accelerated weathering or artificial accelerated irradiation exposures to those
obtained in actual-use conditions is difficult because of variability in both types of exposure and because
laboratory tests never reproduce exactly all the exposure stresses experienced by plastics exposed in
actual-use conditions. No single laboratory exposure test can be specified as a total simulation of actual-use
exposures.
The relative durability of materials in actual-use exposures can be very differen
...