prEN ISO 877-3

SLOVENSKI STANDARD
01-september-2025
Polimerni materiali - Metode izpostavitve vremenskim vplivom - 3. del: Pospešeni
vremenski vpliv z uporabo koncentriranega sončnega sevanja (ISO/DIS 877-
3:2025)
Plastics - Methods of exposure to solar radiation - Part 3: Intensified weathering using
concentrated solar radiation (ISO/DIS 877-3:2025)
Kunststoffe - Freibewitterung - Teil 3: Beschleunigte Bewitterung mit gebündelter
Sonnenstrahlung (ISO/DIS 877-3:2025)
Plastiques - Méthodes d'exposition au rayonnement solaire - Partie 3: Exposition
intensifiée par rayonnement solaire concentré (ISO/DIS 877-3:2025)
Ta slovenski standard je istoveten z: prEN ISO 877-3
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 877-3
ISO/TC 61/SC 6
Plastics — Methods of exposure to
Secretariat: DIN
solar radiation —
Voting begins on:
Part 3: 2025-07-08
Intensified weathering using
Voting terminates on:
2025-09-30
concentrated solar radiation
Plastiques — Méthodes d'exposition au rayonnement solaire —
Partie 3: Exposition intensifiée par rayonnement solaire
concentré
ICS: 83.080.01
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
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Reference number
ISO/DIS 877-3:2025(en)
DRAFT
ISO/DIS 877-3:2025(en)
International
Standard
ISO/DIS 877-3
ISO/TC 61/SC 6
Plastics — Methods of exposure to
Secretariat: DIN
solar radiation —
Voting begins on:
Part 3:
Intensified weathering using
Voting terminates on:
concentrated solar radiation
Plastiques — Méthodes d'exposition au rayonnement solaire —
Partie 3: Exposition intensifiée par rayonnement solaire
concentré
ICS: 83.080.01
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
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Published in Switzerland Reference number
ISO/DIS 877-3:2025(en)
ii
ISO/DIS 877-3:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
5.1 General requirements .2
5.2 Apparatus for measurement of climatic factors .3
6 Test specimens . 3
7 Exposure conditions . 3
7.1 Orientation of mirrors .3
7.2 Exposure site.4
7.3 Temperature control .4
7.4 Irradiance level .5
8 Exposure stages . 6
8.1 General .6
8.2 Solar radiant exposure .6
8.2.1 Guidance for selection of the exposure stage .6
8.2.2 Instrumental measurement of solar radiant exposure .6
9 Procedure . 7
9.1 Mounting of test specimens .7
9.2 Mounting of reference materials (if used) .7
9.3 Climatic observations .7
9.4 Exposure of test specimens .7
9.4.1 General .7
9.4.2 Exposure cycles .7
9.4.3 Testing under glass.7
10 Expression of results . 8
10.1 Determination of changes in properties .8
10.2 Climatic conditions and observations .8
10.2.1 General .8
10.2.2 Temperature .8
10.2.3 Relative humidity .8
10.2.4 Levels (values) of exposure stages .8
10.2.5 Radiation measurement.9
10.2.6 Precipitation .9
10.2.7 Time of wetness .9
10.2.8 Other observations .9
11 Test report . 9
Bibliography .11

iii
ISO/DIS 877-3:2025(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 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 third edition cancels and replaces the second edition (ISO 877-3:2018), which has been technically
revised.
The main changes are as follows:
— size requirements in 7.3 have been added;
— in 10.2.4 a second equation has been added;
— new 10.2.5 “Radiation measurement” has been added.
A list of all parts in the ISO 877 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
DRAFT International Standard ISO/DIS 877-3:2025(en)
Plastics — Methods of exposure to solar radiation —
Part 3:
Intensified weathering using concentrated solar radiation
1 Scope
This document specifies a method for exposing plastics to concentrated solar radiation using reflecting
concentrators to accelerate the weathering processes. The purpose is to assess property changes produced
after specified stages of such exposures. The reflecting concentrators used in these exposures are sometimes
referred to as “Fresnel reflectors” because in cross-section the array of mirrors used to concentrate the
solar radiation resembles the cross-section of a Fresnel lens.
General guidance concerning the scope of the ISO 877 series is given in ISO 877-1.
NOTE Additional information about solar concentrating exposures, including a partial list of standards in which
they are specified, is given in the Bibliography.
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 877-1, Plastics — Methods of exposure to solar radiation — Part 1: General guidance
ISO 877, ‑2, Plastics — Methods of exposure to solar radiation — Part 2: Direct weathering and exposure behind
window glass
ISO 4892-1, Plastics — Methods of exposure to laboratory light sources — Part 1: General guidance and
requirements
ASTM G90, Standard Practice for Performing Accelerated Outdoor Weathering of Nonmetallic Materials Using
Concentrated Natural Sunlight
ASTM G179, Standard Specification for Metal Black Panel and White Panel Temperature Devices for Natural
Weathering Tests
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
This document describes a method for performing accelerated weathering on plastics using intensified solar
radiation. General guidance is given in ISO 877-1.

ISO/DIS 877-3:2025(en)
5 Apparatus
5.1 General requirements
Refer to ISO 877-1 for general requirements.
All requirements for the solar concentrating device, operation of the device and measurement of the solar
radiation within the specimen exposure area shall be in accordance with ASTM G90. See Figures 1 and 2 for
schematic diagrams of the two types of test apparatus.
Key
1 air plenum
2 air blower
3 rotor assembly
4 air deflector
5 A-frame assembly
6 mirror
7 gear box
8 mast for manual elevation adjustment
9 air flow switch
10 water spray nozzles
11 clutch disc for elevation drive
12 solar cells with shadow hat
13 specimen protection door
14 door release mechanism
Figure 1 — Schematic diagram of test apparatus with single-axis tracking
and manual elevation adjustment

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