SIST EN ISO 29469:2023

Thermal insulating products for building applications - Determination of compression behaviour (ISO 29469:2022)

This European Standard specifies the equipment and procedures to be used when determining the compression behaviour of test specimens. It is applicable to thermal insulating products and can be used to determine the compressive stress in compressive creep tests and for applications in which insulation products are only exposed to short-term loads. The method can be used for quality control purposes. It may also be employed to obtain reference values from which design values can be calculated using safety factors.

Wärmedämmstoffe für das Bauwesen - Bestimmung des Verhaltens bei Druckbeanspruchung (ISO 29469:2022)

Diese Internationale Norm legt Prüfeinrichtungen und Verfahren zur Bestimmung des Verhaltens von Probekörpern bei Druckbeanspruchung fest. Sie gilt für Wärmedämmstoffe und kann zur Bestimmung der Druckspannung bei Druck-Kriech-Versuchen und für Anwendungen, bei denen Wärmedämmstoffe nur kurzzeitig belastet werden, angewendet werden.
Das Verfahren kann zur Qualitätskontrolle eingesetzt werden und dient auch dazu, Referenzwerte zu ermitteln, aus denen mit Sicherheitsfaktoren Auslegungswerte berechnet werden können.

Produits isolants thermiques destinés aux applications du bâtiment - Détermination du comportement en compression (ISO 29469:2022)

Le présent document spécifie l’équipement et les modes opératoires pour déterminer le comportement en compression des éprouvettes. Il s’applique aux produits isolants thermiques et peut être utilisé pour déterminer la contrainte en compression lors des essais de fluage en compression et pour des applications dans lesquelles les produits isolants ne sont soumis qu’à des charges de courte durée.
La méthode peut être utilisée à des fins de contrôle de la qualité et peut également être employée pour obtenir des valeurs de référence à partir desquelles des valeurs de conception peuvent être calculées en utilisant des facteurs de sécurité.

Toplotnoizolacijski proizvodi za uporabo v gradbeništvu - Ugotavljanje obnašanja pri tlačni obremenitvi (ISO 29469:2022)

Ta evropski standard določa opremo in postopke za ugotavljanje obnašanja pri tlačni obremenitvi preskušancev. Uporablja se za toplotnoizolacijske proizvode in tudi za določanje tlačne napetosti v tlačnih preskusih lezenja ter za načine uporabe, pri katerih so izolacijski proizvodi samo začasno obremenjeni. Ta metoda se lahko uporablja za preverjanje kakovosti. Lahko se uporablja tudi za pridobivanje referenčnih vrednosti, na podlagi katerih se s pomočjo varnostnih dejavnikov lahko izračunajo vrednosti projektiranja.

General Information

• Status: Published
• Public Enquiry End Date: 15-Jul-2021
• Publication Date: 09-Jan-2023
• ICS: 91.100.60 - Thermal and sound insulating materials
• Technical Committee: TOP - Thermal insulation
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 14-Dec-2022
• Due Date: 18-Feb-2023
• Completion Date: 10-Jan-2023
• Ref Project: EN ISO 29469:2022 - Thermal insulating products for building applications - Determination of compression behaviour (ISO 29469:2022)

Relations

• Replaces: SIST EN 826:2013 - Thermal insulating products for building applications - Determination of compression behaviour
• Effective Date: 01-Feb-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 29469:2023
01-februar-2023
Nadomešča:
SIST EN 826:2013
Toplotnoizolacijski proizvodi za uporabo v gradbeništvu - Ugotavljanje obnašanja
pri tlačni obremenitvi (ISO 29469:2022)
Thermal insulating products for building applications - Determination of compression
behaviour (ISO 29469:2022)
Wärmedämmstoffe für das Bauwesen - Bestimmung des Verhaltens bei
Druckbeanspruchung (ISO 29469:2022)
Produits isolants thermiques destinés aux applications du bâtiment - Détermination du
comportement en compression (ISO 29469:2022)
Ta slovenski standard je istoveten z: EN ISO 29469:2022
ICS:
91.100.60 Materiali za toplotno in Thermal and sound insulating
zvočno izolacijo materials
SIST EN ISO 29469:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 29469:2023

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SIST EN ISO 29469:2023


EN ISO 29469
EUROPEAN STANDARD

NORME EUROPÉENNE

November 2022
EUROPÄISCHE NORM
ICS 91.100.60 Supersedes EN 826:2013
English Version

Thermal insulating products for building applications -
Determination of compression behaviour (ISO
29469:2022)
Produits isolants thermiques destinés aux applications Wärmedämmstoffe für das Bauwesen - Bestimmung
du bâtiment - Détermination du comportement en des Verhaltens bei Druckbeanspruchung (ISO
compression (ISO 29469:2022) 29469:2022)
This European Standard was approved by CEN on 23 October 2022.

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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 29469:2022 E
worldwide for CEN national Members.

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SIST EN ISO 29469:2023
EN ISO 29469:2022 (E)
Contents Page
European foreword . 3

2

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SIST EN ISO 29469:2023
EN ISO 29469:2022 (E)
European foreword
This document (EN ISO 29469:2022) has been prepared by Technical Committee ISO/TC 163 "Thermal
performance and energy use in the built environment" in collaboration with Technical Committee
CEN/TC 88 “Thermal insulating materials and products” the secretariat of which is held by DIN.
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 May 2023, and conflicting national standards shall be
withdrawn at the latest by November 2025.
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 826:2013.
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 29469:2022 has been approved by CEN as EN ISO 29469:2022 without any modification.

3

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SIST EN ISO 29469:2023

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SIST EN ISO 29469:2023
INTERNATIONAL ISO
STANDARD 29469
Second edition
2022-10
Thermal insulating products
for building applications —
Determination of compression
behaviour
Produits isolants thermiques destinés aux applications du bâtiment —
Détermination du comportement en compression
Reference number
ISO 29469:2022(E)
© ISO 2022

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SIST EN ISO 29469:2023
ISO 29469:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2022 – All rights reserved

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SIST EN ISO 29469:2023
ISO 29469:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Test specimens . 4
6.1 Dimensions of specimens . 4
6.2 Specimen preparation . 4
6.3 Number of specimens . 4
6.4 Conditioning of specimens . 5
7 Procedure .5
7.1 Test conditions . 5
7.2 Test procedure . 5
8 Calculation and expression of results . 5
8.1 Compressive strength and corresponding strain . 5
8.1.1 Compressive strength . 5
8.1.2 Strain. 6
8.2 Compressive stress at 10 % strain . 6
8.3 Compression modulus of elasticity . 6
9 Accuracy . 7
10 Test report . 7
Annex A (normative) Modifications to the general test method for cellular glass products .9
iii
© ISO 2022 – All rights reserved

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SIST EN ISO 29469:2023
ISO 29469:2022(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 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 163, Thermal performance and energy use
in the built environment, Subcommittee SC 1, Test and measurement methods, in collaboration with the
European Committee for Standardization (CEN) Technical Committee CEN/TC 88, Thermal insulating
materials and products, in accordance with the Agreement on technical cooperation between ISO and
CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 29469:2008), which has been technically
revised.
The main changes are as follows:
— subclause 5.1 has been modified;
— the conditioning and testing conditions in 6.4 and 7.1 have been modified;
— subclause 8.1.2 has been clarified;
— Annex A, modifications have been made to the general test method for cellular glass products to
include capping in the test protocol;
— some editorial corrections have been made.
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 2022 – All rights reserved

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SIST EN ISO 29469:2023
INTERNATIONAL STANDARD ISO 29469:2022(E)
Thermal insulating products for building applications —
Determination of compression behaviour
1 Scope
This document specifies the equipment and procedures for determining the compression behaviour of
specimens. It is applicable to thermal insulating products and can be used to determine the compressive
stress in compressive creep tests and for applications in which insulation products are exposed only to
short-term loads.
The method can be used for quality control purposes and can also be employed to obtain reference
values from which design values can be calculated using safety factors.
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 5725-2, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method
for the determination of repeatability and reproducibility of a standard measurement method
ISO 29768, Thermal insulating products for building applications — Determination of linear dimensions of
test specimens
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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 .electropedia .org/
3.1
strain
ε
ratio of the reduction in thickness of the test specimen to its initial thickness, d , measured in the
0
direction of loading and expressed as a percentage
3.2
compressive strength
σ
m
ratio of the maximum compressive force, F , reached when the strain, ε, at yield [see Figure 1 b)] or
m
rupture [see Figure 1 a)] is less than 10 %, to the initial cross-sectional area of the test specimen
3.3
compressive stress at 10 % strain
σ
10
ratio of the compressive force, F , at 10 % strain, ε , to the initial cross-section of the test specimen
10 10
[see Figure 1, c) and d)] for products presenting 10 % strain before possible yield or rupture
1
© ISO 2022 – All rights reserved

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SIST EN ISO 29469:2023
ISO 29469:2022(E)
3.4
compression modulus of elasticity
E
compressive stress divided by the corresponding strain below the proportional limit, when the
relationship is linear (see Figure 1)
4 Principle
A compressive force is applied at a given rate of displacement perpendicular to the major faces of a
squarely cut test specimen and the maximum stress supported by the specimen calculated.
When the value of the maximum stress corresponds to a strain of less than 10 %, it is designated as
compressive strength and the corresponding strain is reported. If no failure is observed before the
10 % strain has been reached, the compressive stress at 10 % strain is calculated and its value reported
as compressive stress at 10 % strain.
For cellular glass products, the test method described in this document shall be modified in accordance
with the provisions given in Annex A.
5 Apparatus
5.1 Compression testing machine, designed to suit the range of force and displacement involved
and having two very rigid, polished, square or circular plane parallel platens with a minimum side
length (or diameter) equal to the side length (or diagonal) of the test specimen.
One of the platens shall be fixed and the other shall be movable. If a
...

SLOVENSKI STANDARD
oSIST prEN ISO 29469:2021
01-julij-2021
Toplotno izolacijski proizvodi za uporabo v gradbeništvu - Ugotavljanje obnašanja
pri tlačni obremenitvi (ISO/DIS 29469:2021)
Thermal insulating products for building applications - Determination of compression
behaviour (ISO/DIS 29469:2021)
Wärmedämmstoffe für das Bauwesen - Bestimmung des Verhaltens bei
Druckbeanspruchung (ISO/DIS 29469:2021)
Produits isolants thermiques destinés aux applications du bâtiment - Détermination du
comportement en compression (ISO/DIS 29469:2021)
Ta slovenski standard je istoveten z: prEN ISO 29469
ICS:
91.100.60 Materiali za toplotno in Thermal and sound insulating
zvočno izolacijo materials
oSIST prEN ISO 29469:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 29469:2021

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oSIST prEN ISO 29469:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 29469
ISO/TC 163/SC 1 Secretariat: DIN
Voting begins on: Voting terminates on:
2021-05-12 2021-08-04
Thermal insulating products for building applications —
Determination of compression behaviour
Produits isolants thermiques destinés aux applications du bâtiment — Détermination du comportement en
compression
ICS: 91.100.60
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 29469:2021(E)
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. ISO 2021

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oSIST prEN ISO 29469:2021
EN ISO 29469:2008(E)
ISO/DIS 29469:2021(E)

Contents Page
Foreword .iv
Introduction.Fehler! Textmarke nicht definiert.
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 Principle.2
5 Apparatus.2
6 Test specimens.4
7 Procedure.5
8 Calculation and expression of results .5
9 Accuracy.7
10 Test report.8
Annex A (normative) Modifications to the general test method for cellular glass products.9
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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: [phone]
Fax: [phone]
Email: [e-mail]
© ISO 2008 – All rights reserved iii
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

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oSIST prEN ISO 29469:2021
ISO/DIS 29469:2021(E)
Contents Page
Foreword . iv
Introduction . Fehler! Textmarke nicht definiert.
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle. 2
5 Apparatus . 2
6 Test specimens . 4
7 Procedure . 5
8 Calculation and expression of results . 5
9 Accuracy. 7
10 Test report . 8
Annex A (normative) Modifications to the general test method for cellular glass products . 9
© ISO 2021 – All rights reserved iii

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oSIST prEN ISO 29469:2021
ISO/DIS 29469:2021(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 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 Committee ISO/TC 163, Thermal performance
and energy use in the built environment, Subcommittee SC 1, Test and measurement methods, in
collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC
88, Thermal insulating materials and products, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
This edition cancels and replaces the first edition (ISO 29469:2008) and the standard EN 826:2013,
which have been technically revised. The main changes compared to the previous edition are as follows
Clause 5.3 conditioning of test specimen to reflect the conditions for tropical countries;
Clause 6.1 test conditions and
Clause 9 test report
Annexe A Modifications to the general test method for cellular glass products to include capping in the
test protocol
The standard also includes the ISO 844 as published by ISO TC 61 SC 10. The standard is identical to the
technical content of EN 826.
iv © ISO 2021 – All rights reserved

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oSIST prEN ISO 29469:2021
DRAFT INTERNATIONAL STANDARD ISO/DIS 29469:2021(E)
Thermal insulating products for building applications —
Determination of compression behaviour
1 Scope
This International Standard specifies the equipment and procedures for determining the compression
behaviour of specimens. It is applicable to thermal insulating products and can be used to determine the
compressive stress in compressive creep tests and for applications in which insulation products are exposed
only to short-term loads.
The method can be used for quality control purposes and can also be employed to obtain reference values
from which design values can be calculated using safety factors.
2 Normative references
The following referenced documents are indispensable for the application 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 29768, Thermal insulating products for building applications — Determination of linear dimensions of test
specimens
ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method
for the determination of repeatability and reproducibility of a standard measurement method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
relative deformation
ε
ratio of the reduction in thickness of the test specimen to its initial thickness, d , measured in the direction of
0
loading and expressed as a percentage
3.2
compressive strength
σ
m
ratio of the maximum compressive force, F , reached when the strain, ε, at yield [see Figure 1 b)] or rupture
m
[see Figure 1 a)] is less than 10 %, to the initial cross-sectional area of the test specimen
3.3
compressive stress at 10 % strain
σ
10
ratio of the compressive force, F , at 10 % strain, ε , to the initial cross-section of the test specimen [see
10 10
Figure 1, c) and d)] for products presenting 10 % strain before possible yield or rupture
© ISO 2021 – All rights reserved 1

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oSIST prEN ISO 29469:2021
ISO/DIS 29469:2021(E)
3.4
compression modulus of elasticity
E
compressive stress divided by the corresponding strain below the proportional limit, when the relationship is
linear (see Figure 1)
4 Principle
A compressive force is applied at a given rate of displacement perpendicular to the major faces of a squarely
cut test specimen and the maximum stress supported by the specimen calculated.
When the value of the maximum stress corresponds to a strain of less than 10 %, it is designated as
compressive strength and the corresponding strain is reported. If no failure is observed before the 10 % strain
has been reached, the compressive stress at 10 % strain is calculated and its value reported as compressive
stress at 10 % strain.
5 Apparatus
5.1 Compression testing machine, designed to suit the range of force and displacement involved and
having two very rigid, polished, square or circular plane parallel platens with a minimum side length (or
diameter) equal to the side length (or diagonal) of the test specimen.
One of the platens shall be fixed and the other shall be movable, with a centrally positioned ball joint to ensure
that only axial force is applied to the specimen, if appropriate. The movable platen shall be capable of moving
at a constant rate of displacement in accordance with Clause 7.
5.2 Displacement measuring device, fitted to the compression testing machine, which allows continuous
measurement of the displacement of the movable platen to an accuracy of ± 5 % or ± 0,1 mm, whichever is
smaller (see 5.3).
5.3 Force measuring device, comprised of a sensor fitted to one of the machine platens to measure the
force produced by the reaction of the specimen on the platens. This sensor shall be such that either its own
deformation during the measuring operation is negligible compared with that of the object being measured or
its own deformation shall be taken into account by calculation. In addition, it shall allow the continuous
measurement of the force to an accuracy of ± 1 %.
5.4 Recording device, for the simultaneous recording of the force, F, and the displacement, X, which
provides a curve of F as a function of X (see 7.2).
NOTE The curve gives additional information on the behaviour of the product and possibly enables the determination
of the compression modulus of elasticity.
2 © ISO 2021 – All rights reserved

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oSIST prEN ISO 29469:2021
ISO/DIS 29469:2021(E)
a) b)
c) d)
Key
X displacement
Y force
F force corresponding to the preload
p
F maximum force
m
X displacement at maximum force
m
F force at 10 % strain
10
X displacement at 10 % strain
10
F force corresponding to X (conventional proportional limit)
e e
X displacement in the conventional elastic zone
e
a
X is smaller than 10 %.
m
Figure 1 — Examples of force displacement curves
© ISO 2021 – All rights reserved 3

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oSIST prEN ISO 29469:2021
ISO/DIS 29469:2021(
...