FprEN ISO 2507

SLOVENSKI STANDARD
oSIST prEN ISO 2507:2025
01-maj-2025
Plastomerne cevi in fitingi - Temperatura zmehčišča 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/DIS 2507:2025)
Thermoplastics pipes and fittings - Vicat softening temperature: General test method and
test conditions for Vinyl chloride - based (PVC-U, PVC-C, PVC-Hi) and Acryl nitrile -
based (ABS, ASA) pipes and fittings (ISO/DIS 2507:2025)
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/DIS 2507:2025)
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'acryl nitrile (ABS, ASA) (ISO/DIS
2507:2025)
Ta slovenski standard je istoveten z: prEN ISO 2507
ICS:
23.040.20 Cevi iz polimernih materialov Plastics pipes
23.040.45 Fitingi iz polimernih Plastics fittings
materialov
oSIST prEN ISO 2507:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 2507:2025
oSIST prEN ISO 2507:2025
DRAFT
International
Standard
ISO/DIS 2507
ISO/TC 138/SC 5
Thermoplastics pipes and fittings —
Secretariat: NEN
Vicat softening temperature:
Voting begins on:
General test method and test
2025-02-25
conditions for Vinyl chloride - based
Voting terminates on:
(PVC-U, PVC-C, PVC-Hi) and Acryl
2025-05-20
nitrile - 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'acryl nitrile (ABS, ASA)
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 is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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 SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 2507:2025(en)
oSIST prEN ISO 2507:2025
DRAFT
ISO/DIS 2507:2025(en)
International
Standard
ISO/DIS 2507
ISO/TC 138/SC 5
Thermoplastics pipes and fittings —
Secretariat: NEN
Vicat softening temperature:
Voting begins on:
General test method and test
conditions for Vinyl chloride - based
Voting terminates on:
(PVC-U, PVC-C, PVC-Hi) and Acryl
nitrile - 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'acryl nitrile (ABS, ASA)
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 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
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: +41 22 749 01 11
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 2507:2025(en)
ii
oSIST prEN ISO 2507:2025
ISO/DIS 2507:2025(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
5.1 Means of producing penetration .2
5.2 Indenter . . .2
5.3 Heating equipment .3
5.4 Weights .3
5.5 Temperature-measuring device .3
5.6 Penetration-measuring device .3
5.7 Micrometers and gauges .4
5.8 Oven with air circulation .4
6 Test specimens . 5
6.1 Specimen preparation from pipes .5
6.2 Specimen preparation from fittings .7
6.3 Number of test specimen .7
7 Conditioning . 7
7.1 General .7
7.2 Conditioning for specimens from acrylonitrile-based (ABS, ASA) pipes and fittings .7
8 Procedure . 7
9 Test Report . 8
Annex A (informative) Unplasticized poly(vinyl chloride) (PVC-U) pipes and fittings – Basic
specification . 9
Annex B (informative) Chlorinated poly(vinyl chloride) (PVC-C) pipes and fittings – Basic
specification .10
Annex C (informative) High impact resistant poly (vinyl chloride) (PVC-HI) pipes – Basic
specification .11
Annex D (informative) Acrylonitrile/butadiene/styrene (ABS) pipes and fittings – Basic
specification .12
Annex E (informative) Acrylonitrile/styrene/ acrylic ester (ASA) pipes and fittings – Basic
specification .13

iii
oSIST prEN ISO 2507:2025
ISO/DIS 2507:2025(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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
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.
ISO 2507:1995 consists of the following parts, under the general title Thermoplastics pipes and fittings – Vicat
softening temperature:
— Part 1: General test method
— Part 2: Test conditions for unplasticized poly(vinyl chloride) (PVC-U) or chlorinated poly(vinyl chloride)
(PVC-C) pipes and fittings and for high impact resistant poly(vinyl chloride) (PVC-HI) pipes.
— Part 3: Test conditions for acrylonitrile/butadiene/styrene (ABS) and acrylonitrile/styrene/ acrylic ester
(ASA) pipes and fittings.
This third edition cancels and replaces all three parts of the first edition (ISO 2507-1:1995; ISO 2507-2:1995;
ISO 2507-3:1995), by merging all parts into one document (ISO 2507:2024) and has 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 is described more detailed
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
oSIST prEN ISO 2507:2025
ISO/DIS 2507:2025(en)
Introduction
This International Standard 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.
Please note, however, that ISO 306 is applicable to materials in the form of sheets, whereas this International
Standard is applicable to products in the form of pipes and fittings.
ISO 2507 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.
The basic specifications for various materials are given in the informative annexes.

v
oSIST prEN ISO 2507:2025
oSIST prEN ISO 2507:2025
DRAFT International Standard ISO/DIS 2507:2025(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 Acryl nitrile
- based (ABS, ASA) pipes and fittings
1 Scope
ISO 2507 specifies a general 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.
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.
It also gives, for information, the corresponding base specifications.
It is not applicable to crystalline or semi-crystalline polymers.
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 291, Plastics — Standard atmospheres for conditioning and testing
ISO 306:2022, Plastics — Thermoplastic materials — Determination of Vicat softening temperature (VST)
ISO 472, Plastics — Vocabulary
ISO 16012, Plastics — Determination of linear dimensions of test specimens
IEC 60584-1, Thermocouples -Part 1: EMF specifications and tolerances
IEC 60584-3, Thermocouples - Part 3: Extension and compensating cables - Tolerances and identification system
IEC 60751, Industrial platinum resistance thermometers and platinum temperature sensors
3 Terms and definitions,
For the purposes of this document, the terms and definitions given in ISO 472 and the following apply.
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
...