prEN ISO 18489

SLOVENSKI STANDARD
01-december-2025
Plastomerni materiali za cevne sisteme - Ugotavljanje odpornosti proti počasnemu
razvoju razpok pod cikličnim obremenjevanjem - Preskusna metoda za lomljenje
okroglih palic (CRB) (ISO/DIS 18489:2025)
Thermoplastic materials for piping systems - Determination of resistance to slow crack
growth under cyclic loading - Cracked Round Bar (CRB) test method (ISO/DIS
18489:2025)
Rohre aus Polyethylen - Bestimmung der Widerstandsfähigkeit gegen langsames
Risswachstum unter zyklischer Belastung - Prüfung an gekerbten Rundstäben (ISO/DIS
18489:2025)
Matériaux thermoplastiques pour systèmes de canalisations - Détermination de la
résistance à la propagation lente de fissures sous un chargement cyclique - Méthode
d'essai de la barre ronde fissurée (CRB) (ISO/DIS 18489:2025)
Ta slovenski standard je istoveten z: prEN ISO 18489
ICS:
23.040.45 Fitingi iz polimernih Plastics fittings
materialov
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 18489
ISO/TC 138/SC 5
Thermoplastic materials for
Secretariat: NEN
piping systems — Determination
Voting begins on:
of resistance to slow crack growth
2025-10-15
under cyclic loading — Cracked
Voting terminates on:
Round Bar (CRB) test method
2026-01-07
Matériaux thermoplastiques pour systèmes de canalisations —
Détermination de la résistance à la propagation lente de fissures
sous un chargement cyclique — Méthode d'essai de la barre
ronde fissurée (CRB)
ICS: 23.040.20; 23.040.45
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
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This document has not been edited by the ISO Central Secretariat.
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Reference number
ISO/DIS 18489:2025(en)
DRAFT
ISO/DIS 18489:2025(en)
International
Standard
ISO/DIS 18489
ISO/TC 138/SC 5
Thermoplastic materials for
Secretariat: NEN
piping systems — Determination
Voting begins on:
of resistance to slow crack growth
under cyclic loading — Cracked
Voting terminates on:
Round Bar (CRB) test method
Matériaux thermoplastiques pour systèmes de canalisations —
Détermination de la résistance à la propagation lente de fissures
sous un chargement cyclique — Méthode d'essai de la barre
ronde fissurée (CRB)
ICS: 23.040.20; 23.040.45
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 has not been edited by the ISO Central 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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NATIONAL REGULATIONS.
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 18489:2025(en)
ii
ISO/DIS 18489:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 4
5 Apparatus . 4
5.1 Test machine .4
5.1.1 Loading system .4
5.1.2 Grips.4
5.1.3 Temperature chamber .5
5.2 Microscope .5
5.3 Notching apparatus .5
6 Test specimen . 5
6.1 Specimen geometry and dimensions .5
6.2 Test specimen preparation .6
6.3 Specimen notching .6
6.4 Specimen conditioning .6
7 Test procedure . 7
7.1 Measurement of specimen dimensions .7
7.2 Specimen mounting . .7
7.3 Test atmosphere .7
7.4 Calculation of test load .7
7.5 Load-cycle frequency .8
7.6 Load application .8
7.7 Initial crack length calculation .8
8 Data treatment . 9
9 Test report .10
Annex A (informative) Recalculation between different test specimen diameters and single
point interpolation .12
Annex B (informative) Test parameters for PE . 14
Annex C (informative) Test parameters for PP .16
Annex D (informative) Test parameters for PA-U (PA-U11, PA-U12) . 17
Bibliography . 19

iii
ISO/DIS 18489:2025(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
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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
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This document was prepared by Technical Committee ISO/TC 138 Plastics pipes, fittings and valves for the
transport of fluids , Subcommittee SC 05, General properties of pipes, fittings and valves of plastic materials
and their accessories — Test methods and basic specifications.
This second edition cancels and replaces the first edition (ISO 18489:2015), which has been technically
revised.
The main changes are as follows:
— Improved Clause 7.7 for initial crack length calculation
— Improved informative Annex A for recalculation between different specimen diameters and added
information in A.2 and A.3 for the single point evaluation.
— All test parameters for different materi
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