EN ISO 2505:2023

SLOVENSKI STANDARD
01-december-2023
Nadomešča:
SIST EN ISO 2505:2005
Termoplastične (plastomerne) cevi - Dolžinska reverzija - Preskusna metoda in
parametri (ISO 2505:2023)
Thermoplastics pipes - Longitudinal reversion - Test method and parameters (ISO
2505:2023)
Rohre aus Thermoplasten - Längsschrumpf - Prüfverfahren und Kennwerte (ISO
2505:2023)
Tubes en matières thermoplastiques - Retrait longitudinal à chaud - Méthode d'essai et
paramètres (ISO 2505:2023)
Ta slovenski standard je istoveten z: EN ISO 2505:2023
ICS:
23.040.20 Cevi iz polimernih materialov Plastics pipes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 2505
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2023
EUROPÄISCHE NORM
ICS 23.040.20 Supersedes EN ISO 2505:2005
English Version
Thermoplastics pipes - Longitudinal reversion - Test
method and parameters (ISO 2505:2023)
Tubes en matières thermoplastiques - Retrait Rohre aus Thermoplasten - Längsschrumpf -
longitudinal à chaud - Méthode d'essai et paramètres Prüfverfahren und Kennwerte (ISO 2505:2023)
(ISO 2505:2023)
This European Standard was approved by CEN on 12 September 2023.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2505:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 2505:2023) has been prepared by Technical Committee ISO/TC 138 "Plastics
pipes, fittings and valves for the transport of fluids" in collaboration with Technical Committee CEN/TC
155 “Plastics piping systems and ducting systems” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2024, and conflicting national standards shall be
withdrawn at the latest by April 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 2505:2005.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 2505:2023 has been approved by CEN as EN ISO 2505:2023 without any modification.

INTERNATIONAL ISO
STANDARD 2505
Fourth edition
2023-10
Thermoplastics pipes — Longitudinal
reversion — Test method and
parameters
Tubes en matières thermoplastiques — Retrait longitudinal à chaud
— Méthode d'essai et paramètres
Reference number
ISO 2505:2023(E)
ISO 2505:2023(E)
© ISO 2023
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
ISO 2505:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 1
5 Principle . 2
6 Apparatus . 2
7 Preparation . 3
7.1 Test piece . 3
7.2 Conditioning. 4
8 Procedure .4
9 Expression of results . 5
10 Test report . 5
Annex A (informative) Recommended basic specifications for longitudinal reversion .6
iii
ISO 2505:2023(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 document 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 138, Plastics pipes, fittings and valves
for the transport of fluids, Subcommittee SC 5, General properties of pipes, fittings and valves of plastic
materials and their accessories —Test methods and basic specifications, in collaboration with the
European Committee for Standardization (CEN) Technical Committee CEN/TC 155, Plastic piping
systems and ducting systems, in accordance with the Agreement on technical cooperation between ISO
and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 2505:2005), which has been technically
revised.
The main changes are as follows:
— the following materials and their respective test requirements have been added: PE 100-RC, PB-H,
PB-R, PE-RT, PP-RCT and PE-UHMW;
— a requirement has been added stating that small diameter pipes from coils are to be straightened
prior to testing.
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
INTERNATIONAL STANDARD ISO 2505:2023(E)
Thermoplastics pipes — Longitudinal reversion — Test
method and parameters
1 Scope
This document specifies a method for determining the longitudinal reversion of thermoplastics pipes,
to be carried out in either a liquid or in air. In case of dispute, heated liquid is used as the reference.
This document is applicable to all thermoplastics pipes with smooth internal and external walls of
constant cross-section. It is not applicable to non-smooth structured-wall thermoplastics pipes.
The parameters appropriate to the pipe material and recommendations for the maximum levels of
reversion as a function of the pipe material are given in Annex A.
This method is applicable for pipes of wall thickness ≤ 16 mm.
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 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics
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 Abbreviated terms
For the purposes of this document, the abbreviated terms used for the plastic materials given in
ISO 1043-1 and the following apply.
ABS acrylonitrile/butadiene/styrene
ASA acrylonitrile/styrene/acrylate
MRS minimum required strength
PA-U unplasticized polyamide
PB-H polybutene homopolymer
PB-R polybutylene random copolymer
PE 32/40 polyethylene MRS 3,2/4
ISO 2505:2023(E)
PE 50/63 polyethylene MRS 5/6,3
PE 80 polyethylene MRS 8
PE 100 polyethylene MRS 10
PE 100-RC PE 100 with raised crack resistance
PE-RT polyethylene with raised temperature resistance
PE-UHMW polyethylene with ultra-high molecular weight
PE-X cross-linked polyethylene
PP-B polypropylene block co
...