oSIST prEN ISO 75-3:2024

SLOVENSKI STANDARD
01-oktober-2024
Polimerni materiali - Določanje temperature upogiba pod obremenitvijo -
Duromerni (termoreaktivni) laminati z visoko trdnostjo in polimeri, ojačeni z
dolgimi vlakni (ISO/DIS 75-3:2024)
Plastics - Determination of temperature of deflection under load - Part 3: High-strength
thermosetting laminates and long-fibre-reinforced plastics (ISO/DIS 75-3:2024)
Kunststoffe- Bestimmung der Wärmeformbeständigkeitstemperatur - Teil 3:
Hochbeständige härtbare Schichtstoffe und langfaserverstärkte Kunststoffe (ISO/DIS 75-
3:2024)
Plastiques - Détermination de la température de fléchissement sous charge - Partie 3:
Stratifiés thermodurcissables à haute résistance et plastiques renforcés de fibres
longues (ISO/DIS 75-3:2024)
Ta slovenski standard je istoveten z: prEN ISO 75-3
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.

DRAFT
International
Standard
ISO/DIS 75-3
ISO/TC 61/SC 2
Plastics — Determination of
Secretariat: KATS
temperature of deflection under
Voting begins on:
load —
2024-07-29
Part 3:
Voting terminates on:
2024-10-21
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
ICS: 83.080.10; 83.120
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
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INTERNATIONAL STANDARD UNTIL
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This document is circulated as received from the committee secretariat.
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Reference number
ISO/DIS 75-3:2024(en)
DRAFT
ISO/DIS 75-3:2024(en)
International
Standard
ISO/DIS 75-3
ISO/TC 61/SC 2
Plastics — Determination of
Secretariat: KATS
temperature of deflection under
Voting begins on:
load —
Part 3:
Voting terminates on:
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
ICS: 83.080.10; 83.120
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 2024
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
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BE CONSIDERED IN THE LIGHT OF THEIR
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WHICH REFERENCE MAY BE MADE IN
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NATIONAL REGULATIONS.
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 75-3:2024(en)
ii
ISO/DIS 75-3:2024(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 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 . 3
6.1 General .3
6.2 Shape and dimensions .3
6.3 Specimen inspection .3
6.4 Number of test specimens .3
6.5 Test-specimen preparation .3
6.6 Annealing .4
7 Conditioning . 4
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/DIS 75-3:2024(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 61, Plastics, Subcommittee SC 2, Mechanical
behavior, in collaboration with the European Committee for Standardization (CEN) Technical Committee
CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation between ISO and CEN
(Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 75-3:2004), which has been technically
revised.
The main changes are as follows:
— Update Introduction, Scope and Principle;
— Updated the normative references and the bibliography;
— Changed the span definition by using a formula complying with ISO 178;
— Added preferred specimen thickness dimensions;
— Added examples of initial deflection, error and standard deflection calculations;
— Added a precision statement Annex.
A list of all parts in the ISO 75 series can be found on the ISO website.
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/DIS 75-3:2024(en)
Introduction
The first edition of ISO 75-1 and this part of ISO 75 (1993) described a method for the determination of
the temperature of deflection under load (bending stress) of high-strength thermosetting laminates and
compression-moulded long-fibre reinforced plastics. The test load used was not a fixed load, as in part 2
of this International Standard, but a function (1/10) of the ultimate or specified load applied flatwise on
specim
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