SIST EN ISO 2507:2026

SLOVENSKI STANDARD
01-april-2026
Plastomerne cevi in fitingi - Temperatura mehčanja po Vicatu - Splošna preskusna
metoda in preskusni pogoji za cevi in fitinge na osnovi vinilklorida (PVC-U, PVC-C,
PVC-Hi) in akrilonitrila (ABS, ASA) (ISO 2507:2026)
Thermoplastics pipes and fittings - Vicat softening temperature - General test method
and test conditions for vinyl chloride-based (PVC-U, PVC-C, PVC-HI) and acrylonitrile-
based (ABS, ASA) pipes and fittings (ISO 2507:2026)
Rohre und Formstücke aus Thermoplasten - Vicat-Erweichungstemperatur - Allgemeines
Prüfverfahren und Prüfbedingungen für Rohre und Formstücke auf Poly(vinylchlorid)-
(PVC-U, PVC-C, PVC-Hi) und auf Acrylnitrilbasis (ABS, ASA) (ISO 2507:2026)
Tubes et raccords en matières thermoplastiques - Température de ramollissement Vicat
- Méthode d'essai générale et conditions d’essai pour les tubes et raccords à base de
chlorure de vinyle (PVC-U, PVC-C, PVC-HI) et à base d'acrylonitrile (ABS, ASA) (ISO
2507:2026)
Ta slovenski standard je istoveten z: EN ISO 2507:2026
ICS:
23.040.20 Cevi iz polimernih materialov Plastics pipes
23.040.45 Fitingi iz polimernih Plastics fittings
materialov
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 2507
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2026
EUROPÄISCHE NORM
ICS 23.040.20; 23.040.45 Supersedes EN ISO 2507-1:2017, EN ISO 2507-2:2017,
EN ISO 2507-3:2017
English Version
Thermoplastics pipes and fittings - Vicat softening
temperature - General test method and test conditions for
vinyl chloride-based (PVC-U, PVC-C, PVC-HI) and
acrylonitrile-based (ABS, ASA) pipes and fittings (ISO
2507:2026)
Tubes et raccords en matières thermoplastiques - Rohre und Formstücke aus Thermoplasten - Vicat-
Température de ramollissement Vicat - Méthode Erweichungstemperatur - Allgemeines Prüfverfahren
d'essai générale et conditions d'essai pour les tubes et und Prüfbedingungen für Rohre und Formstücke auf
raccords à base de chlorure de vinyle (PVC-U, PVC-C, Poly(vinylchlorid)- (PVC-U, PVC-C, PVC-Hi) und auf
PVC-HI) et à base d'acrylonitrile (ABS, ASA) (ISO Acrylnitrilbasis (ABS, ASA) (ISO 2507:2026)
2507:2026)
This European Standard was approved by CEN on 11 January 2026.

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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2507:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 2507:2026) 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 August 2026, and conflicting national standards shall
be withdrawn at the latest by August 2026.
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 2507-1:2017, EN ISO 2507-2:2017 and EN ISO 2507-3:2017.
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 2507:2026 has been approved by CEN as EN ISO 2507:2026 without any modification.

International
Standard
ISO 2507
Third edition
Thermoplastics pipes and fittings —
2026-01
Vicat softening temperature —
General test method and test
conditions for vinyl chloride-
based (PVC-U, PVC-C, PVC-HI) and
acrylonitrile-based (ABS, ASA) pipes
and fittings
Tubes et raccords en matières thermoplastiques — Température
de ramollissement Vicat — Méthode d'essai générale et
conditions d’essai pour les tubes et raccords à base de chlorure de
vinyle (PVC-U, PVC-C, PVC-HI) et à base d'acrylonitrile (ABS, ASA)
Reference number
ISO 2507:2026(en) © ISO 2026
ISO 2507:2026(en)
© ISO 2026
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 2507:2026(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Test specimens . 5
6.1 Specimen preparation from pipes .5
6.2 Specimen preparation from fittings .6
6.3 Number of test specimen .7
7 Conditioning . 7
8 Procedure . 7
9 Test report . 8
Bibliography . 9

iii
ISO 2507:2026(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 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, Plastics piping systems and ducting systems, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition of ISO 2507 cancels and replaces ISO 2507-1:1995, ISO 2507-2:1995 and ISO 2507-3:1995,
which have been technically revised.
The main changes are as follows:
— the document was modified following edition 6 of ISO 306:2022;
— the procedure for test piece preparation from pipes and fittings was described in more detail.
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 2507:2026(en)
Introduction
This document is based on ISO 306.
For convenience of use, it has been considered preferable to draw up a complete document for use in
determining the Vicat softening temperature of thermoplastics pipes and fittings. For further details,
reference to ISO 306 is recommended.
However, that ISO 306 is applicable to materials in the form of sheets, whereas this document is applicable to
products in the form of pipes and fittings.
This document gives the general conditions under which the Vicat softening temperature of pipes and
fittings is determined and provides the particular requirements for conducting tests on pipes and fittings of
various materials.
v
International Standard ISO 2507:2026(en)
Thermoplastics pipes and fittings — Vicat softening
temperature — General test method and test conditions for
vinyl chloride-based (PVC-U, PVC-C, PVC-HI) and acrylonitrile-
based (ABS, ASA) pipes and fittings
1 Scope
This document specifies a specific method for determining the Vicat softening temperature (VST) of
thermoplastics pipes and fittings. It includes the adaption of method B 50 of ISO 306:2022 using a force of
50 N and a heating rate of 50 °C/h and the procedure for specimen preparation.
It includes the particular test conditions for determining the Vicat softening temperature (VST) of
unplasticized poly(vinylchloride) (PVC-U) or chlorinated poly(vinylchloride) (PVC-C) pipes and fittings, for
high impact resistance poly(vinylchloride) (PVC-HI) pipes and for acrylonitrile/butadiene/styrene (ABS)
and acrylonitrile/styrene/acrylic ester (ASA) pipes and fittings.
This document can also be used for pipes and fittings from other materials (e.g. PE-UHMW).
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
...