SIST EN ISO 75-3:2025

SLOVENSKI STANDARD
01-oktober-2025
Polimerni materiali - Določanje temperature upogiba pod obremenitvijo -
Duromerni (termoreaktivni) laminati z visoko trdnostjo in polimeri, ojačeni z
dolgimi vlakni (ISO 75-3:2025)
Plastics - Determination of temperature of deflection under load - Part 3: High-strength
thermosetting laminates and long-fibre-reinforced plastics (ISO 75-3:2025)
Kunststoffe- Bestimmung der Wärmeformbeständigkeitstemperatur - Teil 3:
Hochbeständige härtbare Schichtstoffe und langfaserverstärkte Kunststoffe (ISO 75-
3:2025)
Plastiques - Détermination de la température de fléchissement sous charge - Partie 3:
Stratifiés thermodurcissables à haute résistance et plastiques renforcés de fibres
longues (ISO 75-3:2025)
Ta slovenski standard je istoveten z: EN ISO 75-3:2025
ICS:
83.080.10 Duromeri Thermosetting materials
83.120 Ojačani polimeri Reinforced plastics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 75-3
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2025
EUROPÄISCHE NORM
ICS 83.080.10; 83.120 Supersedes EN ISO 75-3:2004, EN ISO 75-
3:2004/AC:2006
English Version
Plastics - Determination of temperature of deflection
under load - Part 3: High-strength thermosetting laminates
and long-fibre-reinforced plastics (ISO 75-3:2025)
Plastiques - Détermination de la température de Kunststoffe- Bestimmung der
fléchissement sous charge - Partie 3: Stratifiés Wärmeformbeständigkeitstemperatur - Teil 3:
thermodurcissables à haute résistance et plastiques Hochbeständige härtbare Schichtstoffe und
renforcés de fibres longues (ISO 75-3:2025) langfaserverstärkte Kunststoffe (ISO 75-3:2025)
This European Standard was approved by CEN on 9 August 2025.

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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 75-3:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 75-3:2025) has been prepared by Technical Committee ISO/TC 61 Plastics" in
collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by SIS.
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 February 2026, and conflicting national standards
shall be withdrawn at the latest by February 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 75-3:2004.
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 75-3:2025 has been approved by CEN as EN ISO 75-3:2025 without any modification.

International
Standard
ISO 75-3
Third edition
Plastics — Determination of
2025-07
temperature of deflection under
load —
Part 3:
High-strength thermosetting
laminates and long-fibre-reinforced
plastics
Plastiques — Détermination de la température de fléchissement
sous charge —
Partie 3: Stratifiés thermodurcissables à haute résistance et
plastiques renforcés de fibres longues
Reference number
ISO 75-3:2025(en) © ISO 2025
ISO 75-3:2025(en)
© ISO 2025
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 75-3:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
5.1 Means of producing a flexural stress .2
5.2 Heating equipment .2
5.3 Weights .2
5.4 Temperature-measuring instrument .2
5.5 Deflection-measuring instrument .2
5.6 Micrometers and gauges .2
6 Test specimens . 2
6.1 General .2
6.2 Shape and dimensions .2
6.3 Specimen inspection .3
6.4 Number of test specimens .3
6.5 Test-specimen preparation .3
6.6 Annealing .3
7 Conditioning and drying . 3
8 Procedure . 4
8.1 Calculation of the force to be applied .4
8.2 Initial temperature of the heating equipment .4
8.3 Measurement .4
9 Expression of results . 5
10 Precision . 5
11 Test report . 5
Annex A (informative) Precision data . 6
Bibliography .11

iii
ISO 75-3:2025(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 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 cautio
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